ceph.ceph-container-common remove symlink

This error was introduced in the recent refactor of ceph-docker-common
in https://github.com/ceph/ceph-ansible/pull/3251. However, the Ansible
galaxy linter is not happy about it and fails importing the role.
Removing this since it's not used anymore.

Signed-off-by: Sébastien Han <seb@redhat.com>

diff --git a/roles/ceph.ceph-container-common b/roles/ceph.ceph-container-common
deleted file mode 120000 (symlink)
index a91f25d..0000000
--- a/roles/ceph.ceph-container-common
+++ /dev/null
@@ -1 +0,0 @@
-ceph-container-common
\ No newline at end of file