custom git submodules were not working
Merge branch 'release-4.6' of github.com:dhubler/sipxecs into release-4.6
PT-46899091:  Set entitydb pointers to NULL to avoid double deletion during shut down
PT45231735: Freeswitch conference config is wrong if you disable DTMF

- do not generate caller controls if not defined
- fixed precommit
PT-46800361 - unzip polycom firmware into correct folder, as it might be packed into a different folder structure.
Merge branch 'poly-unpack-fw' into release-4.6-unstable

Conflicts:
	mak/build.mk.in