send_raw and send_raw_get_response now take a string list rather than a string

Signed-off-by: John Else <john.else@citrix.com>
Implement enableoutput, disableoutput

Signed-off-by: John Else <john.else@citrix.com>
Simplify the implementation of ping

Signed-off-by: John Else <john.else@citrix.com>