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envsetup: Make installboot work in recovery mode too

 * Needs a change to adb to allow waiting for recovery

Change-Id: Ia90645513f46bcb5f20b7c74c55ef15842710d3d
Merge tag 'android-4.2.2_r1.2' of https://android.googlesource.com/platform/build into cm-10.1

Android 4.2.2 release 1.2

# gpg: Signature made Wed 17 Apr 2013 12:58:50 PM PDT using DSA key ID 9AB10E78
# gpg: Can't check signature: public key not found
Merge branch 'cm-10.1' into martincz