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b599138842
proxies, listeners and server shared counters are now managed via helpers
added in one of the previous commits.
When guid is not set (ie: when not yet assigned), shared counters pointer
is allocated using calloc() (local memory) and a flag is set on the shared
counters struct to know how to manipulate (and free it). Else if guid is
set, then it means that the counters may be shared so while for now we
don't actually use a shared memory location the API is ready for that.
The way it works, for proxies and servers (for which guid is not known
during creation), we first call counters_{fe,be}_shared_get with guid not
set, which results in local pointer being retrieved (as if we just
manually called calloc() to retrieve a pointer). Later (during postparsing)
if guid is set we try to upgrade the pointer from local to shared.
Lastly, since the memory location for some objects (proxies and servers
counters) may change from creation to postparsing, let's update
counters->last_change member directly under counters_{fe,be}_shared_get()
so we don't miss it.
No change of behavior is expected, this is only preparation work.