add otatools-package target
add otatools-package target

Add a target to zip up all the otatools and releasetools, for easy
copying to the OTA builder machine.

Change-Id: I55a6d93c1de75ac936d941c0e3ae72897407f563
(cherry picked from commit f22b0f43efbc16c548692dc239a387edda15d78f)

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build