'phablet-shell: only start/stop ssh if it is not already running, do not wipe authorized_keys (breaks the SDK) and instead only append the key if it is not there yet. make sure ~/.ssh exists before trying to do anything with it (LP: #1355286) (LP: #1337289) (LP: #1326805)
Approved by: zbenjamin, PS Jenkins bot, ♫ Robert Bruce Park ♫