Force HostName property to be read-only per the schema

The ManagerNetworkProtocol schema defines the HostName entry to be
read-only. Change the doPatch code to prevent updating the hostname
attribute.

The DMTF redfish/v1/Managers/bmc/NetworkProtocol is a read-only
location.

The DMTF approved location for changing the HostName is:
redfish/v1/Managers/bmc/EthernetInterfaces/<str>

This change does not impact phosphor-webui, as it uses D-Bus to
perform all of its work.
This change does not impact webui-vue, as it is using the DMTF
approved API.

This commit deprecates allowing Read/Write access to the Hostname in
the ManagersNetworkProtocol URI. To reduce the impact to Redfish
clients that rely upon Read/Write access a Meson compile time flag has
been added to allow Read/Write access to be restored. The Meson build
flag, redfish-allow-deprecated-hostname-patch, can be enabled to
restore Read/Write access. The Meson build flag is slated to be
removed in Q4 2021 enforcing the read-only state.

Tested:
Explicitly PATCH'd HostName to confirm it cannot be modified.
Enabled the HostName feature, and confirmed the HostName accepted a
PATCH command.
Ran Redfish_Service_Validator (deprecated, and re-enabled).

Change-Id: If7f2148d8bbb8a7b420c4abde086272c4320977a
Signed-off-by: Johnathan Mantey <johnathanx.mantey@intel.com>

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