Clean up dangling references to cmd pipes

Also removes the schema references for these CMD pipes as they are no
longer required.

daemon-common/zkhandler.py

@@ -560,10 +560,6 @@ class ZKSchema(object):
             "config.primary_node.sync_lock": f"{_schema_root}/config/primary_node/sync_lock",
             "config.upstream_ip": f"{_schema_root}/config/upstream_ip",
             "config.migration_target_selector": f"{_schema_root}/config/migration_target_selector",
-            "cmd": f"{_schema_root}/cmd",
-            "cmd.node": f"{_schema_root}/cmd/nodes",
-            "cmd.domain": f"{_schema_root}/cmd/domains",
-            "cmd.ceph": f"{_schema_root}/cmd/ceph",
             "logs": "/logs",
             "node": f"{_schema_root}/nodes",
             "domain": f"{_schema_root}/domains",