[microversions] Add support for 2.19

2.19 - Allow the user to set and get the server description. The user will
       be able to set the description when creating, rebuilding, or updating
       a server, and get the description as part of the server details.

Methods `rebuild` and `create` of novaclient.v2.servers.ServerManager were
not wrapped with `api_versions.wraps` decorator to reduce code and docsting
duplication. Version checks added inside these methods.

Change-Id: I75b804c6edd0cdf02c2cd002d0b5968fec8da545

1 files changed, 18 insertions, 0 deletions

diff --git a/novaclient/exceptions.py b/novaclient/exceptions.py
index b9bdf114..c502e964 100644
--- a/novaclient/exceptions.py
+++ b/novaclient/exceptions.py
@@ -24,6 +24,24 @@ class UnsupportedVersion(Exception):
     pass
 
 
+class UnsupportedAttribute(AttributeError):
+    """Indicates that the user is trying to transmit the argument to a method,
+    which is not supported by selected version.
+    """
+
+    def __init__(self, argument_name, start_version, end_version=None):
+        if end_version:
+            self.message = (
+                "'%(name)s' argument is only allowed for microversions "
+                "%(start)s - %(end)s." % {"name": argument_name,
+                                          "start": start_version,
+                                          "end": end_version})
+        else:
+            self.message = (
+                "'%(name)s' argument is only allowed since microversion "
+                "%(start)s." % {"name": argument_name, "start": start_version})
+
+
 class CommandError(Exception):
     pass