build: remove ceph-qa-suite directory

after commit 3afb889 "qa: add supported distros for ceph-ansible", git
submodule update commands are failing with:

No submodule mapping found in .gitmodules for path 'ceph-qa-suite'

Signed-off-by: Casey Bodley <cbodley@redhat.com>

diff --git a/ceph-qa-suite b/ceph-qa-suite
deleted file mode 160000 (submodule)
index ecf6a57..0000000
--- a/ceph-qa-suite
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit ecf6a5722775e93554c0f67ebf4a5d6f4e8115c3