[Pure Storage] Fix volume reconnect error

When trying to connect a volume to a host when it is already connected
will result in an AttributeError.

This patch resolves that issue.

Closes-Bug: #2121464
Change-Id: Ia251f9fa808a77e046da5726bb225ac66bacfc61
Signed-off-by: Simon Dodsley <simon@purestorage.com>

cinder/volume/drivers/pure.py

@@ -3637,7 +3637,7 @@ class PureISCSIDriver(PureBaseVolumeDriver, san.SanISCSIDriver):
         for array in target_arrays:
             connection = self._connect(array, pure_vol_name, connector,
                                        chap_username, chap_password)
-            if not connection[0].lun:
+            if not connection[0]['lun']:
                 # Swallow any exception, just warn and continue
                 LOG.warning("self._connect failed.")
                 continue

releasenotes/notes/pure_reconnect_failure-7bbc135eecc77695.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Pure Storage `bug #2121464
+    <https://bugs.launchpad.net/cinder/+bug/2121464>`_: Fixed
+    ``AttributeError`` when trying to connect a volume to a host when
+    the volume is already connected to the host.