Clean up line continuation in Storwize driver

There are multiple places in the Storwize driver where '\' is used
for line  continuation. This patch replaces '\' with '()' to make
the code consistent.

Change-Id: Ic64f0562f1e25e499c4fecd366998e31e8ebee7a

cinder/volume/drivers/ibm/storwize_svc/__init__.py

@@ -207,12 +207,12 @@ def do_setup(self, ctxt):
             raise exception.InvalidInput(reason=msg)
 
         # Check if compression is supported
-        self._state['compression_enabled'] = \
-            self._helpers.compression_enabled()
+        self._state['compression_enabled'] = (self._helpers.
+                                              compression_enabled())
 
         # Get the available I/O groups
-        self._state['available_iogrps'] = \
-            self._helpers.get_available_io_groups()
+        self._state['available_iogrps'] = (self._helpers.
+                                           get_available_io_groups())
 
         # Get the iSCSI and FC names of the Storwize/SVC nodes
         self._state['storage_nodes'] = self._helpers.get_node_info()
@@ -461,8 +461,8 @@ def initialize_connection(self, volume, connector):
                 if len(conn_wwpns) == 0:
                     # TODO(xqli): Remove storwize_svc_npiv_compatibility_mode
                     # in M release.
-                    npiv_compat = self.configuration.\
-                        storwize_svc_npiv_compatibility_mode
+                    npiv_compat = (self.configuration.
+                                   storwize_svc_npiv_compatibility_mode)
                     if not npiv_compat:
                         msg = (_('Could not get FC connection information for '
                                  'the host-volume connection. Is the host '

cinder/volume/drivers/ibm/storwize_svc/helpers.py

@@ -643,9 +643,9 @@ def get_vdisk_copies(self, vdisk):
                   'secondary': None}
 
         resp = self.ssh.lsvdiskcopy(vdisk)
-        for copy_id, status, sync, primary, mdisk_grp in \
+        for copy_id, status, sync, primary, mdisk_grp in (
             resp.select('copy_id', 'status', 'sync',
-                        'primary', 'mdisk_grp_name'):
+                        'primary', 'mdisk_grp_name')):
             copy = {'copy_id': copy_id,
                     'status': status,
                     'sync': sync,