sipcall: make SIPCall::setCallMediaLocal() private

setCallMediaLocal is used to setup transport related options.
We also don't use anymore the local IP argument.
So this patch remove the argument, move it into ctor
and make setCallMediaLocal private (all calls removed).

This has the good side effect to remove the non-permited ICE API call
causing an error in logs.

Change-Id: I69220c253164777e8e88b6a4deef451325458c2c
Reviewed-by: Olivier Soldano <olivier.soldano@savoirfairelinux.com>