samba: Config options not needed for testing

These config options aren't needed for testing
the ceph vfs module with samba 4.x.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
fabfile: Reuse install of ceph-build and gnupg

Signed-off-by: Sam Lang <sam.lang@inktank.com>
samba: Use upstream samba repo

Signed-off-by: Sam Lang <sam.lang@inktank.com>
samba: Only build master branch

Adds a branches-local-samba file for samba that
will only build the master branch of the samba repo.
The branches-local-samba script only outputs branches
listed in the PRIORITIZED list, skipping other branches
and tags.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
samba: Use branches-local-samba in gitbuilder

We need to specify the branches-local-samba script for the
samba gitbuilder.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
samba: Make branches-local-samba executable

Signed-off-by: Sam Lang <sam.lang@inktank.com>
fabfile: Allow symlink for branches-local

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