Semaphore for subCache when mutex policy is none

[kzangeli]

Right now, the subscription cache uses the mongo request semaphore, but this has an important limitation - the broker cannot be started with -mutexPolicy != all, unless also -noCache is present.

To fix this, the subscription cache needs a semahpore of its own, in case the mongo request semaphore is not in use.

And, this must be removed from contextBroker.cpp:

if ((strcmp(reqMutexPolicy, "all") != 0) && (noCache == false))
{
  LM_E(("Bad Input (reqMutexPolicy != 'all'  AND  subscription-cache CANNOT be used together in 0.24.0 (cache can be disabled using -noCache))"));
  exit(1);
}

Effort: 2 man day

[fgalan]

Fixed in PR #1435