The argparse module automatically replaces '-' characters with '_'
characters when converting an option string to an attribute:
«For optional argument actions, the value of dest is normally inferred
from the option strings. ArgumentParser generates the value of dest by
taking the first long option string and stripping away the initial --
string. If no long option strings were supplied, dest will be derived
from the first short option string by stripping the initial - character.
Any internal - characters will be converted to _ characters to make sure
the string is a valid attribute name.»[1]
This means that the value of the "--remote-region" option of the
"image-import" command will be available as "args.remote_region";
"remote-region" would not be a valid attribute anyway.
We make sure to retrieve the proper value for the following
options: --remote-region, --remote-image-id and
--remote-service-interface.
[1] https://docs.python.org/3/library/argparse.html#dest
Change-Id: I1d8c69acd5d61fdc426469cd87d1ace81871e60f
Partial-Bug: #2012442
e2190c4feb