Tools: correct altitude check
Tools: correct tests syntax
Tools: add autotest syntax check on common
Tools: search for syntax mistake on autotest lambda
Tools: put copter in hover trottle to prevent crash
Tools: reboot after baterry failsafe test
Tools: copter takeoff wait_ready_to_arm before arming
Tools: arm copter after land on RTL
Tools: reset copter battery voltage after battery failsafe
