Setting tag plcapi-5.0-33

Setting tag plcapi-5.0-33
ratelimit aspects
cache getslivers per node if PLC_GET_SIVERS_CACHE is enabled
requires Django for cache_utils
attempt to expose 'pldistro' to sfa
last_time_spent_online, last_time_spent_offline: new fields in Node
new slice tags 'isolate_loopback' and 'cpu_cores'
refresh-peer federation logs dump exceptions
modpython logs have a timestamp
more verbose/accurate php error reporting
postgresql listens on PLC_DB_HOST+localhost instead of 0.0.0.0
AddNode, UpdateNode: manage tags directly rather than through another method
BootUpdateNode: only update once
GetPersons: techs can access the list of persons on their site
GetSlices and GetSliceTags: techs can see slices on their nodes
GetSlivers: isrootonsite tag; cacheable