STE
ADB Logcat colored output.

This patch adds a new '-C' option to logcat so that the output is
colored with colors similar to the ones in DDMS.
Simply type "adb logcat -C" to use it.
Works well with bash in gnome-terminal.

Change-Id: Ie72199ecca0e04f2082c993f5763646bb09da61ea
fix up adb to prefer /sbin/sh if it exists

Change-Id: I5c15731c95d123488e90aaeac5b497f556b53363
host