tags defined on Person and Site were not exposed to Filter, so that e.g.
GetPersons({'hrn':<something>},['email','hrn'])
was failing although the 'hrn' tag is marked as expose_to_api
Setting tag plcapi-5.3-4
enable filtering on tags (like hrn) with GetPersons and GetSites
allow GetSlices to filter on tags as well
Setting tag plcapi-5.3-5
allow GetSlices to filter on tags as well
Merge remote-tracking branch 'upstream/master'