Move getRegion() in CinderVolume to deploy() method

getRegion() method in CinderVolume class was called before
the region was created in Environment class.

This patch moves usage of this function to deploy() method to
have region already created.

Change-Id: I542e5e7bf85bbf8dd83ac746e203e2e7e6b6f111
Closes-Bug: #1626048

meta/io.murano/Classes/resources/CinderVolume.yaml

@@ -49,11 +49,6 @@ Properties:
     Contract: $.class(CinderVolumeBackup)
 
 Methods:
-  .init:
-    Body:
-    - $._environment: $.find(std:Environment).require()
-    - $._region: $.getRegion()
-
   buildResourceDefinition:
     Body:
     - $properties:
@@ -99,6 +94,7 @@ Methods:
 
   deploy:
     Body:
+    - $._region: $.getRegion()
     - If: $.sourceSnapshot != null
       Then:
         $.sourceSnapshot.validate()