Added optional availability_zone flag for instance

Change-Id: I8ab62831481ceb27e672a265b0deaa6e3d39260a
Implements: blueprint availability-zone-instance-create

troveclient/cli.py

@@ -44,7 +44,8 @@ class InstanceCommands(common.AuthedCommandsBase):
         'marker',
         'name',
         'size',
-        'backup'
+        'backup',
+        'availability_zone'
     ]
 
     def create(self):
@@ -57,7 +58,8 @@ class InstanceCommands(common.AuthedCommandsBase):
         if self.backup:
             restorePoint = {"backupRef": self.backup}
         self._pretty_print(self.dbaas.instances.create, self.name,
-                           self.flavor, volume, restorePoint=restorePoint)
+                           self.flavor, volume, restorePoint=restorePoint,
+                           availability_zone=self.availability_zone)
 
     def delete(self):
         """Delete the specified instance"""

troveclient/instances.py

@@ -56,7 +56,7 @@ class Instances(base.ManagerWithFind):
     resource_class = Instance
 
     def create(self, name, flavor_id, volume=None, databases=None, users=None,
-               restorePoint=None):
+               restorePoint=None, availability_zone=None):
         """
         Create (boot) a new instance.
         """
@@ -72,6 +72,8 @@ class Instances(base.ManagerWithFind):
             body["instance"]["users"] = users
         if restorePoint:
             body["instance"]["restorePoint"] = restorePoint
+        if availability_zone:
+            body["instance"]["availability_zone"] = availability_zone
 
         return self._create("/instances", body, "instance")