ceph_deploy: Add local sudo transport method

Adds a local transport with sudo to parallel the existing ssh
sudo transport for pushy.  Override the original local
transport __init__ to prevent initializer from overwriting
the command line.  (Bug #4367)

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>