envsetup.sh: remove cmremote, cmgerrit and cmrebase

Change-Id: I87f4a38b7134fd1861185034a631467a592edd7b
envsetup.sh: fix aospremote

Change-Id: Ib31cc7609c5398b2b1fcb4b869d3d353998db4b9
envsetup.sh: add cmremote
similar to aosp remote

Change-Id: If5eab451316ece41df7a64c993489c5e0db746d4
envsetup.sh: add cafremote

Change-Id: I6290e9c15a9385069970f6e10d5aa6be6b73098f
envsetup.sh: add linaroremote

Change-Id: Ia4d901ff9f759eb4925f289d73c377ecdb24803f