remove sudo_pushy from the connection helper

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
port gatherkeys to use remoto

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
move a misc function to remotes

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>