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When ha1 password storage is enabled (the default), the lookup of LinphoneAuthInfo must be done with realm, otherwise the password will not work.

Fix problem with missing SDP in 200 OK when the call is in early-media. We should recover correctly, we were not.
Also introduced the corresponding unit test.

There is now an "SDP handling mode": you can choose between normal, simulate removal of SDP or simulate SDP error.
This allows for simulating 200 OK without SDP, for instance (a unit test is coming for this).

All multicast tests are passed on windows

Conflicts:
	coreapi/remote_provisioning.c