Description of problem:

'bydefault' needs a space to separate the words

[test@localhost ~]$ rhpkg import --help
usage: rhpkg import [-h] [--skip-diffs] srpm

This will extract sources, patches, and the spec file from an srpm and update
the current module accordingly. It will import to the current branch
bydefault.

positional arguments:
  srpm          Source rpm to import

optional arguments:
  -h, --help    show this help message and exit
  --skip-diffs  Don't show diffs when import srpms


Version-Release number of selected component (if applicable):
rhpkg-1.26-1.el7eng.noarch