Port VM on-node tasks to Celery worker system

Adds Celery versions of the flush_locks, device_attach, and
device_detach functions.

node-daemon/pvcnoded/objects/VMInstance.py

@@ -28,8 +28,6 @@ from threading import Thread
 
 from xml.etree import ElementTree
 
-from re import match
-
 import daemon_lib.common as common
 
 import pvcnoded.objects.VMConsoleWatcherInstance as VMConsoleWatcherInstance
@@ -1058,54 +1056,3 @@ class VMInstance(object):
                     )
 
         return True
-
-
-# Primary command function
-def vm_command(zkhandler, logger, this_node, data):
-    # Get the command and args
-    command, dom_uuid, *args = data.split()
-
-    if match("success-.*", command) or match("failure-.*", command):
-        return
-
-    logger.out(
-        'Getting command "{}" for domain "{}"'.format(command, dom_uuid), state="i"
-    )
-
-    # Verify that the VM is set to run on this node
-    domain = this_node.d_domain.get(dom_uuid, None)
-    if domain is None:
-        return False
-
-    if domain.getnode() != this_node.name:
-        return
-
-    # Lock the command queue
-    zk_lock = zkhandler.writelock("base.cmd.domain")
-    with zk_lock:
-        # Flushing VM RBD locks
-        if command == "flush_locks":
-            result = VMInstance.flush_locks(zkhandler, logger, dom_uuid, this_node)
-        # Attaching a device
-        elif command == "attach_device":
-            xml_spec = " ".join(args)
-            result = domain.attach_device(xml_spec)
-        # Detaching a device
-        elif command == "detach_device":
-            xml_spec = " ".join(args)
-            result = domain.detach_device(xml_spec)
-        # Command not defined
-        else:
-            result = False
-
-        # Command succeeded
-        if result:
-            # Update the command queue
-            zkhandler.write([("base.cmd.domain", "success-{}".format(data))])
-        # Command failed
-        else:
-            # Update the command queue
-            zkhandler.write([("base.cmd.domain", "failure-{}".format(data))])
-
-        # Wait 1 seconds before we free the lock, to ensure the client hits the lock
-        time.sleep(1)