3892359 changed builder args to always be arrays, so concatenation of
rpmbuild options with other strings then failed.
File "/usr/lib/python2.7/site-packages/tito/release/main.py", line 530, in _koji_release
builder.srpm(dist=disttag)
File "/usr/lib/python2.7/site-packages/tito/builder/main.py", line 210, in srpm
rpmbuild_options = self.rpmbuild_options + self._scl_to_rpmbuild_option()
TypeError: can only concatenate list (not "str") to list
Change builder args to be joined by a single space, allowing multiple
arguments to be passed in.
Instead of being a command line-only option, the string of extra rpmbuild
arguments can now be passed in via the general builder args mechanism, so it
can even be configured from releasers.conf.
Fixes#155
Particularly useful when creating new projects and wanting to avoid
creating an initial tag, this allows `tito build --test --srpm` etc
to run without any tag.
With a general 'scl' builder option, a software collection name can be
specified irrespective of the releaser used. RsyncReleaser's own 'scl'
option has been deprecated in favour of using 'builder.scl' in
releasers.conf.
