Add tempest tests for Share Replication

By default, these tests are disabled; 3rd party CI systems
should enable these tests through the
RUN_MANILA_REPLICATION_TESTS environment variable
if their driver supports share replication.

Partially implements: blueprint manila-share-replication
Co-Authored-By: Goutham Pacha Ravi <gouthamr@netapp.com>
Co-Authored-By: Andrew Kerr <andrew.kerr@netapp.com>

Change-Id: Idaf3c61600337cc30568b982dfb23948209c1d6e
diff --git a/manila_tempest_tests/share_exceptions.py b/manila_tempest_tests/share_exceptions.py
index 505b385..3a11531 100644
--- a/manila_tempest_tests/share_exceptions.py
+++ b/manila_tempest_tests/share_exceptions.py
@@ -65,3 +65,8 @@
 
 class ResourceReleaseFailed(exceptions.TempestException):
     message = "Failed to release resource '%(res_type)s' with id '%(res_id)s'."
+
+
+class ShareReplicationTypeException(exceptions.TempestException):
+    message = ("Option backend_replication_type is set to incorrect value: "
+               "%(replication_type)s")