tree 9502dd5d3103b13ca91d7400056aa8d7d8800825
parent d9f7771a068f7e4b12fc4f77e49c56f26cf275d3
author Patrick Williams <patrick@stwcx.xyz> 1630532016 -0500
committer Patrick Williams <patrick@stwcx.xyz> 1630712839 +0000

meta-phosphor: make discovery bbclass use override syntax

In the spirit of consistency with the new upstream override
syntax, change phosphor-discovery-service.bbclass to use it
and make tree-wide changes as appropriate.

After the change checked on Witherspoon on QEMU:
```
root@witherspoon:/etc/avahi/services# ls
obmc_console.service  obmc_redfish.service  obmc_rest.service
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib1fe3cce57a0130378af789abd83b457e0c3a318