Automatically do 'adb disable-verity' if needed

This also adds 'adb wait-for-device' before 'adb root'
to correctly handle the case that device is not ready yet when
runtest.sh is executed.

Bug: 67326963

Test: run 'adb enable-verify' and 'adb reboot'
    then execute run_test.sh
    observe that 'adb disable-verify' is executed.

Test: run 'adb disable-verify' and 'adb reboot'
    then execute run_test.sh
    observe that 'adb disable-verify' is not executed.

Change-Id: I064a6408fefee13cc3c4882f060e3b5059364d4f
1 file changed