at exit set running vm status to requested_start

ucloud_common/enums.py

@@ -0,0 +1,31 @@
+from enum import Enum
+
+class VMStatus(Enum):
+    # Must be only assigned to brand new VM
+    requested_new = "REQUESTED_NEW"
+
+    # Only Assigned to already created vm
+    requested_start = "REQUESTED_START"
+
+    # These all are for running vms
+    requested_shutdown = "REQUESTED_SHUTDOWN"
+    requested_suspend = "REQUESTED_SUSPEND"
+    requested_resume = "REQUESTED_RESUME"
+    requested_migrate = "REQUESTED_MIGRATE"
+
+    # either its image is not found or user requested
+    # to delete it
+    deleted = "DELETED"
+    
+    stopped = "STOPPED" # After requested_shutdown
+    killed = "KILLED"  # either host died or vm died itself
+
+    running = "RUNNING"
+    suspended = "SUSPENDED"
+
+    running_vm_statuses = [requested_shutdown, requested_suspend,
+                           requested_resume, requested_migrate,
+                           running, suspended]
+class HostStatus(Enum):
+    alive = "ALIVE"
+    dead = "DEAD"