Finish up Ceph OSD removal, add locking to commands

client-common/common.py

@@ -175,6 +175,15 @@ def verifyNode(zk_conn, node):
     else:
         return False
 
+#
+# Verify OSD is valid in cluster
+#
+def verifyOSD(zk_conn, osd_id):
+    if zkhandler.exists(zk_conn, '/ceph/osds/{}'.format(osd_id)):
+        return True
+    else:
+        return False
+
 #
 # Get the primary coordinator node
 #