The '--flavor' option appears in the usage and arglist but is not
actually parsed. The '--flavor-id' option is what is silently parsed.
Since the goal is to allow the name or the id, this adds the '--flavor'
option to being parsed.
Closes-Bug: 2091731
Change-Id: Id83facd3825f472e7d864427699bd072d1c08779
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>