Allow inheritFrom in Gerrit configs
Allow inheritFrom in Gerrit configs

In order to utilize Gerrit's project configuration inheritance
mechanism, we need to support the inheritFrom option. Allow it in
the whitelist for our ACL normalization script.

Change-Id: Id23b348bf42d322d5c97903ad82101ac1dc01c27

openstack-infra/project-config,openstack-infra/project-config