first stab at renaming signed repos to dist repos

sed -i -e 's/signed\(.\?[Rr]epo\)/dist\1/g'
sed -i -e 's/Signed\(.\?[Rr]epo\)/Dist\1/g'

tests/test_cli/data/list-commands.txt

@@ -119,7 +119,7 @@ miscellaneous commands:
         import-comps              Import group/package information from a comps file
         moshimoshi                Introduce yourself
         save-failed-tree          Create tarball with whole buildtree
-        signed-repo               create a yum repo of GPG signed RPMs
+        dist-repo               create a yum repo of GPG signed RPMs
 
 monitor commands:
         wait-repo                 Wait for a repo to be regenerated