PT45579013 - Assertion in sipxpark on Ctrl+C

The assertion was happening in mongo cleanup code. It seems that mongo needs
some help to cleanup nicely and this is done by adding an explicit call to
mongo::dbexit(mongo::EXIT_CLEAN).

This was added in all components that were showing this assert: park, rls, saa.
Merge branch 'PT45579013' into release-4.6

Conflicts:
	sipXpark/src/main.cpp