ceph-docker-common: add symlink to ceph.ceph-docker-common

This allows for the role to be used with ansible-galaxy and to fix the
include in all the meta/main.yml files in the roles.

Signed-off-by: Andrew Schoen <aschoen@redhat.com>

diff --git a/roles/ceph.ceph-docker-common b/roles/ceph.ceph-docker-common
new file mode 120000 (symlink)
index 0000000..d50dbad
--- /dev/null
+++ b/roles/ceph.ceph-docker-common
@@ -0,0 +1 @@
+ceph-docker-common
\ No newline at end of file