AllowedHostTransitions: look for on dbus

Commit [1] introduced a new optional dbus property that OpenBMC
developers can populate to define which
redfish/v1/Systems/system/ResetActionInfo AllowableValues are.

Look for that new property on dbus. If not found, hard code the
previous values otherwise utilize the property to fill in the return
value.

Tested:
- Put new property on dbus and confirmed Redfish API returned expected
  values:
```
curl -k -H "X-Auth-Token: $token" -X GET https://${bmc}/redfish/v1/Systems/system/ResetActionInfo
{
  "@odata.id": "/redfish/v1/Systems/system/ResetActionInfo",
  "@odata.type": "#ActionInfo.v1_1_2.ActionInfo",
  "Id": "ResetActionInfo",
  "Name": "Reset Action Info",
  "Parameters": [
    {
      "AllowableValues": [
        "ForceOff",
        "PowerCycle",
        "Nmi",
        "On",
        "ForceOn",
        "ForceRestart",
        "GracefulRestart",
        "GracefulShutdown"
      ],
      "DataType": "String",
      "Name": "ResetType",
      "Required": true
    }
  ]
}
```
- Did not run redfish validator as response was same as previous

[1]: https://gerrit.openbmc.org/c/openbmc/phosphor-dbus-interfaces/+/68933

Change-Id: Iecece14e7ff55db98d96df71b106ecc9e3f0ac33
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/meson.build b/meson.build
index f4976c1f9b..65aa99a939 100644
--- a/meson.build
+++ b/meson.build
@@ -455,6 +455,7 @@ srcfiles_unittest = files(
   'test/redfish-core/include/utils/time_utils_test.cpp',
   'test/redfish-core/lib/chassis_test.cpp',
   'test/redfish-core/lib/sensors_test.cpp',
+  'test/redfish-core/lib/system_test.cpp',
   'test/redfish-core/lib/log_services_dump_test.cpp',
   'test/redfish-core/lib/log_services_test.cpp',
   'test/redfish-core/lib/update_service_test.cpp',