samba: Clean old ceph bits before getting new

samba: Clean old ceph bits before getting new

Debian/Ubuntu does not tie the package versions the same way the rpm
packagin does so upgrading a single package won't remove any old
packages. Remove the old bits before installing any new.

This should fix a build failure on xenial where there were two libcephfs
libraries present on the system at the time of build which broke the
build.

Signed-off-by: Boris Ranto <branto@redhat.com>