Fixed mounting /system when 'override_prop' is enabled.

Change-Id: I59f035498c2a2d65869cb7f7e6ea9e311b9757be
Edify: Add AssertSomeBaseband

Allow releasetools.py to assert a baseband version. Works just like
AssertSomeBootloader.

Change-Id: Ic8eb341cef1d777d983be25ba21a3bc545819c29
Merge remote-tracking branch 'cm/cm-11.0' into HEAD

Conflicts:
	tools/releasetools/ota_from_target_files

Change-Id: Ica3e6bfd79d41912d373b57e0b541d90b7a9ac90