Dell EMC PS: Fix extend volume creating unmanaged snapsots

The Dell EMC PS driver's extend volume code is missing the
no-snap option and creates unmanaged snapshots in the background.
Added that option to fix it.

Closes Bug: #1720454

Change-Id: I48398331fe086760a88bd5ca4c0f28f90e22bd0b
(cherry picked from commit 0910706e76)

cinder/volume/drivers/dell_emc/ps.py

@@ -136,10 +136,11 @@ class PSSeriesISCSIDriver(san.SanISCSIDriver):
         1.4.1 - Rebranded driver to Dell EMC.
         1.4.4 - Fixed over-subscription ratio calculation
         1.4.5 - Optimize volume stats information parsing
+        1.4.6 - Extend volume with no-snap option
 
     """
 
-    VERSION = "1.4.5"
+    VERSION = "1.4.6"
 
     # ThirdPartySytems wiki page
     CI_WIKI_NAME = "Dell_Storage_CI"
@@ -608,7 +609,7 @@ class PSSeriesISCSIDriver(san.SanISCSIDriver):
         """Extend the size of the volume."""
         try:
             self._eql_execute('volume', 'select', volume['name'],
-                              'size', "%sG" % new_size)
+                              'size', "%sG" % new_size, 'no-snap')
             LOG.info(_LI('Volume %(name)s resized from '
                          '%(current_size)sGB to %(new_size)sGB.'),
                      {'name': volume['name'],

releasenotes/notes/ps-extend_volume-no-snap-8aa447c50f2475a7.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - Dell EMC PS Series Driver was creating unmanaged snapshots
+    when extending volumes. Fixed it by adding the missing
+    no-snap parameter. This change fixes bug 1720454.