Add min_microversion for ServerRescueTestJSONUnderV235

Define explicit min_microversion value to avoid the API version range
checking error.

Related-prod: PRODX-28656

Change-Id: Id5ec96998e25e744d5c4b109325ca7d50587056a
diff --git a/tempest/api/compute/servers/test_server_rescue.py b/tempest/api/compute/servers/test_server_rescue.py
index c31ac0b..c4be66c 100644
--- a/tempest/api/compute/servers/test_server_rescue.py
+++ b/tempest/api/compute/servers/test_server_rescue.py
@@ -77,6 +77,7 @@
 class ServerRescueTestJSONUnderV235(ServerRescueTestBase):
     """Test server rescue with compute microversion less than 2.36"""
 
+    min_microversion = '2.1'
     max_microversion = '2.35'
 
     # TODO(zhufl): After 2.35 we should switch to neutron client to create