allow force for pkglist_add

Using force option will allow 'pre-blocking' of packages which are not
in tag inheritance yet, but could cause a problem if they'll get to
inheritance chain somehow. In such case we don't have an owner for
package and using 'force' allows admin to introduce blocked package with
him as an owner.

Fixes: https://pagure.io/koji/issue/867

cli/koji_cli/commands.py

@@ -364,6 +364,7 @@ def handle_block_pkg(goptions, session, args):
     usage = _("usage: %prog block-pkg [options] tag package [package2 ...]")
     usage += _("\n(Specify the --help global option for a list of other help options)")
     parser = OptionParser(usage=usage)
+    parser.add_option("--force", action='store_true', default=False, help=_("Override blocks and owner if necessary"))
     (options, args) = parser.parse_args(args)
     if len(args) < 2:
         parser.error(_("Please specify a tag and at least one package"))
@@ -386,7 +387,7 @@ def handle_block_pkg(goptions, session, args):
         return ret
     session.multicall = True
     for package in args[1:]:
-        session.packageListBlock(tag, package)
+        session.packageListBlock(tag, package, force=options.force)
     session.multiCall(strict=True)