health: Add option to disable health-populate

The Health populate calls GetManagedObjects at `/` which can take a lot
of time. Add the option to disable to improve performance if it is not
needed.

Tested:
```
$  meson build -Dhealth-populate=disabled
...
 User defined options
    backend                               : ninja
    health-populate                       : disabled
```

Build passed.

Health Status removed. Some resource still create HealthPopulate, but
does not populate. It will require further refactoring to clean it out.

Testing on `/redfish/v1/Chassis?$expand=.($levels=1)`

On 14 chassis, from about 2.5 seconds to 400 ms. :)

Before:
```
Getting times for chassis
Getting good line count with wget -q -O- localhost:80/redfish/v1/Chassis?$expand=.($levels=1)
Line count: 980
17:05:56: real 0m2.908s user 0m0.000s sys 0m0.030s
17:05:59: real 0m2.414s user 0m0.010s sys 0m0.010s
17:05:03: real 0m3.410s user 0m0.000s sys 0m0.020s
17:05:09: real 0m2.372s user 0m0.000s sys 0m0.010s
17:05:13: real 0m3.407s user 0m0.010s sys 0m0.000s
17:05:19: real 0m2.420s user 0m0.010s sys 0m0.000s
17:05:23: real 0m3.463s user 0m0.010s sys 0m0.000s
17:05:29: real 0m2.414s user 0m0.000s sys 0m0.010s
17:05:33: real 0m2.843s user 0m0.010s sys 0m0.010s
17:05:38: real 0m2.512s user 0m0.000s sys 0m0.020s
17:05:42: real 0m2.474s user 0m0.000s sys 0m0.010s
17:05:47: real 0m2.557s user 0m0.010s sys 0m0.010s
17:05:52: real 0m2.439s user 0m0.020s sys 0m0.000s
17:05:56: real 0m3.127s user 0m0.010s sys 0m0.000s
17:05:01: real 0m2.563s user 0m0.020s sys 0m0.000s
17:05:06: real 0m2.392s user 0m0.020s sys 0m0.020s
17:05:10: real 0m2.405s user 0m0.020s sys 0m0.000s
17:05:15: real 0m2.514s user 0m0.010s sys 0m0.010s
17:05:19: real 0m2.809s user 0m0.020s sys 0m0.010s
17:05:24: real 0m2.944s user 0m0.010s sys 0m0.010s
17:05:29: real 0m2.537s user 0m0.010s sys 0m0.000s
17:05:34: real 0m3.290s user 0m0.000s sys 0m0.000s
17:05:39: real 0m2.601s user 0m0.040s sys 0m0.000s
17:05:43: real 0m2.398s user 0m0.010s sys 0m0.040s
17:05:48: real 0m2.664s user 0m0.000s sys 0m0.020s
17:05:53: real 0m2.323s user 0m0.010s sys 0m0.000s
17:05:57: real 0m3.033s user 0m0.000s sys 0m0.010s
17:05:02: real 0m3.243s user 0m0.000s sys 0m0.010s
17:05:07: real 0m2.604s user 0m0.010s sys 0m0.010s
17:05:12: real 0m2.813s user 0m0.010s sys 0m0.010s
17:05:17: real 0m2.325s user 0m0.020s sys 0m0.000s
17:05:21: real 0m2.577s user 0m0.010s sys 0m0.000s
17:05:26: real 0m2.882s user 0m0.030s sys 0m0.000s
17:05:31: real 0m2.572s user 0m0.000s sys 0m0.020s
17:05:35: real 0m2.678s user 0m0.010s sys 0m0.010s
17:05:40: real 0m2.656s user 0m0.010s sys 0m0.010s
17:05:45: real 0m2.921s user 0m0.020s sys 0m0.000s
17:05:49: real 0m2.723s user 0m0.000s sys 0m0.020s
17:05:54: real 0m2.910s user 0m0.010s sys 0m0.010s
17:05:59: real 0m2.601s user 0m0.020s sys 0m0.000s
17:05:04: real 0m2.615s user 0m0.000s sys 0m0.000s
```

After:
```
Getting times for chassis
Getting good line count with wget -q -O- localhost:80/redfish/v1/Chassis?$expand=.($levels=1)
Line count: 980
16:04:43: real 0m0.188s user 0m0.020s sys 0m0.000s
16:04:43: real 0m0.195s user 0m0.010s sys 0m0.000s
16:04:45: real 0m0.219s user 0m0.010s sys 0m0.000s
16:04:48: real 0m0.226s user 0m0.020s sys 0m0.000s
16:04:50: real 0m0.208s user 0m0.020s sys 0m0.010s
16:04:52: real 0m0.226s user 0m0.010s sys 0m0.010s
16:04:54: real 0m0.419s user 0m0.000s sys 0m0.010s
16:04:57: real 0m0.222s user 0m0.010s sys 0m0.020s
16:04:59: real 0m0.194s user 0m0.000s sys 0m0.010s
16:04:01: real 0m0.191s user 0m0.010s sys 0m0.010s
16:04:04: real 0m0.276s user 0m0.010s sys 0m0.020s
16:04:06: real 0m0.183s user 0m0.020s sys 0m0.000s
16:04:08: real 0m0.193s user 0m0.040s sys 0m0.000s
16:04:10: real 0m0.406s user 0m0.020s sys 0m0.010s
16:04:13: real 0m0.317s user 0m0.000s sys 0m0.000s
16:04:15: real 0m0.442s user 0m0.005s sys 0m0.005s
16:04:18: real 0m0.226s user 0m0.010s sys 0m0.000s
16:04:20: real 0m0.217s user 0m0.020s sys 0m0.000s
16:04:22: real 0m0.200s user 0m0.010s sys 0m0.030s
16:04:24: real 0m0.423s user 0m0.010s sys 0m0.010s
16:04:27: real 0m0.203s user 0m0.020s sys 0m0.010s
16:04:29: real 0m0.433s user 0m0.000s sys 0m0.000s
16:04:31: real 0m0.318s user 0m0.020s sys 0m0.000s
16:04:34: real 0m1.206s user 0m0.000s sys 0m0.010s
16:04:37: real 0m0.403s user 0m0.000s sys 0m0.020s
16:04:39: real 0m0.353s user 0m0.010s sys 0m0.000s
16:04:42: real 0m0.291s user 0m0.000s sys 0m0.030s
16:04:44: real 0m0.742s user 0m0.020s sys 0m0.010s
16:04:47: real 0m0.369s user 0m0.010s sys 0m0.000s
16:04:49: real 0m0.215s user 0m0.020s sys 0m0.000s
16:04:52: real 0m0.204s user 0m0.000s sys 0m0.010s
16:04:54: real 0m0.418s user 0m0.000s sys 0m0.000s
16:04:56: real 0m0.215s user 0m0.000s sys 0m0.010s
16:04:58: real 0m0.202s user 0m0.010s sys 0m0.010s
16:04:01: real 0m0.202s user 0m0.010s sys 0m0.010s
16:04:03: real 0m0.212s user 0m0.010s sys 0m0.000s
16:04:05: real 0m0.694s user 0m0.010s sys 0m0.010s
16:04:08: real 0m0.201s user 0m0.010s sys 0m0.010s
16:04:10: real 0m0.230s user 0m0.000s sys 0m0.020s
16:04:12: real 0m0.206s user 0m0.010s sys 0m0.010s
16:04:15: real 0m0.446s user 0m0.010s sys 0m0.010s
```

Change-Id: I90b242e2cd24973420de871fedf9793dd1e310f3
Signed-off-by: Willy Tu <wltu@google.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/meson_options.txt b/meson_options.txt
index 3c2d3f78dd..3f37f9e100 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -325,3 +325,11 @@ option(
                     enable on production systems at this time.  Other query
                     parameters such as only are not controlled by this option.'''
 )
+
+option(
+    'health-populate',
+    type: 'feature',
+    value: 'enabled',
+    description: '''Enables HealthPopulate and generate the Status property for
+                    the resource'''
+)