fabfile: Symlink for branches-local in non-rh case

We want to allow a symlink from a specific branches-local file
(like branches-local-samba) to the branches-local file used by
gitbuilder.  To do so, we need to move the default out of the way.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
samba: Include needed packages

Signed-off-by: Sam Lang <sam.lang@inktank.com>