Update help text for encryption provider

The volume encryption provider no longer uses class names.
Instead, 'luks' and 'plain' are used. This patch updates
the help text for the volume encryption provider to use
the new encryption provider format constants.

Change-Id: I2911098505a99658e04ac4008e5f3e857db81f95

Author: briannapoulos

doc/source/cli/command-objects/volume-type.rst

@@ -62,8 +62,8 @@ Create new volume type
 
 .. option:: --encryption-provider <provider>
 
-    Set the class that provides encryption support for this volume type
-    (e.g "LuksEncryptor") (admin only)
+    Set the encryption provider format for this volume type
+    (e.g "luks" or "plain") (admin only)
 
     This option is required when setting encryption type of a volume.
     Consider using other encryption options such as: :option:`--encryption-cipher`,
@@ -197,8 +197,8 @@ Set volume type properties
 
 .. option:: --encryption-provider <provider>
 
-    Set the class that provides encryption support for this volume type
-    (e.g "LuksEncryptor") (admin only)
+    Set the encryption provider format for this volume type
+    (e.g "luks" or "plain") (admin only)
 
     This option is required when setting encryption type of a volume for the first time.
     Consider using other encryption options such as: :option:`--encryption-cipher`,

openstackclient/volume/v1/volume_type.py

@@ -70,8 +70,8 @@ def get_parser(self, prog_name):
         parser.add_argument(
             '--encryption-provider',
             metavar='<provider>',
-            help=_('Set the class that provides encryption support for '
-                   'this volume type (e.g "LuksEncryptor") (admin only) '
+            help=_('Set the encryption provider format for '
+                   'this volume type (e.g "luks" or "plain") (admin only) '
                    '(This option is required when setting encryption type '
                    'of a volume. Consider using other encryption options '
                    'such as: "--encryption-cipher", "--encryption-key-size" '
@@ -254,8 +254,8 @@ def get_parser(self, prog_name):
         parser.add_argument(
             '--encryption-provider',
             metavar='<provider>',
-            help=_('Set the class that provides encryption support for '
-                   'this volume type (e.g "LuksEncryptor") (admin only) '
+            help=_('Set the encryption provider format for '
+                   'this volume type (e.g "luks" or "plain") (admin only) '
                    '(This option is required when setting encryption type '
                    'of a volume. Consider using other encryption options '
                    'such as: "--encryption-cipher", "--encryption-key-size" '

openstackclient/volume/v2/volume_type.py

@@ -112,8 +112,8 @@ def get_parser(self, prog_name):
         parser.add_argument(
             '--encryption-provider',
             metavar='<provider>',
-            help=_('Set the class that provides encryption support for '
-                   'this volume type (e.g "LuksEncryptor") (admin only) '
+            help=_('Set the encryption provider format for '
+                   'this volume type (e.g "luks" or "plain") (admin only) '
                    '(This option is required when setting encryption type '
                    'of a volume. Consider using other encryption options '
                    'such as: "--encryption-cipher", "--encryption-key-size" '
@@ -371,8 +371,8 @@ def get_parser(self, prog_name):
         parser.add_argument(
             '--encryption-provider',
             metavar='<provider>',
-            help=_('Set the class that provides encryption support for '
-                   'this volume type (e.g "LuksEncryptor") (admin only) '
+            help=_('Set the encryption provider format for '
+                   'this volume type (e.g "luks" or "plain") (admin only) '
                    '(This option is required when setting encryption type '
                    'of a volume for the first time. Consider using other '
                    'encryption options such as: "--encryption-cipher", '