Don't advertise mute cells capabilities upwards

Fixes bug 1190473

Change-Id: Ic61b549869b1434df81407e499ec8b00ba8f328f
Replace utils.to_bytes() with strutils.to_bytes()

The to_bytes() function have moved to oslo.
Replaced/removed the to_bytes() function with the one in strutils

Change-Id: I14c33c6fb86db3088c11e02ce6e38ec022fad042
Merge "Don't advertise mute cells capabilities upwards"
Merge "Replace utils.to_bytes() with strutils.to_bytes()"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp