ad-hoc, ap, and wsc all had descriptions longer than the max width but
this is now taken care of automatically. Remove the tab and newline's
from the description.
The WSC pin command description was also changed to be more accurate
since the pin does not need to be 8 digits.
Doing 'ad-hoc <wlan> start_open <"network name">' returned a
"No matching method found" error because start_open called
net.connman.iwd.AdHoc.Start instead of net.connman.iwd.AdHoc.StartOpen.
Station, WSC, Ad-Hoc and AP family_arg_completion functions were
identical except for which commands they were referencing and the
interface type they were interested in. Combine all these into a single
function.
