Config change to skip hold before merge request

Config value introduced to skip apps sending
hold request before merge.
Vendor IMS solution will be responsible to do both.i.e.hold
followed by merge request.

Change-Id: I1aec0f95381d43b3f7f1704fce988f0796839c36

Conflicts:
	core/res/res/values/config.xml
	core/res/res/values/symbols.xml