deploy.sh: do not expect a parameter for -h

deploy.sh: do not expect a parameter for -h

If -h was given as a parameter to the script, it would report an error
as it expected a parameter, and if it was called as the only parameter,
it would run deploy.py as if "old style" parameters had been given, thus
showing the usage for the python script, instead of the expected usage
message for this script.

Update the usage message to include -h.

Change-Id: I0930936962c1cb479ec4409ff114cd60a386b276
Signed-off-by: Josep Puigdemont <josep.puigdemont@enea.com>