Modify limits fields according to microversion

1. Some limits fields are removed from Microversion 2.35/2.38/2.56,
   so we should check limits fields according to microversion.
2. In test_max_metadata_exceed_limit, maxImageMeta is deprecated from
   Microversion 2.38, so maxServerMeta is used instead, btw, maxServerMeta
   seems to be more suitable for this testcase.
   Besides, test_max_metadata_exceed_limit is not used in interop, so we
   can safely change its name.

ref: https://developer.openstack.org/api-ref/compute/#show-rate-and-absolute-limits

Implements blueprint: clear-deprecated-api

Change-Id: I53e2ee82c9c52afb0a56526c655eb9b3b6b8f483
diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index ea868ae..56f5ea4 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -338,10 +338,18 @@
 
   .. _2.32: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id29
 
+  * `2.36`_
+
+  .. _2.36: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#microversion
+
   * `2.37`_
 
   .. _2.37: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id34
 
+  * `2.39`_
+
+  .. _2.39: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id35
+
   * `2.42`_
 
   .. _2.42: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#maximum-in-ocata