Skip real-data tests in non-real-data jobs

I am excluding strategies execution with annotation `real_load` in
non-real-load jobs.

This is partial backport of [1].

[1] https://review.opendev.org/c/openstack/watcher/+/945627

Change-Id: I77d4c23ebc21693bba8ca0247b8954c6dc8eaba9

.zuul.yaml

@@ -34,6 +34,7 @@
     vars:
       tempest_concurrency: 1
       tempest_test_regex: watcher_tempest_plugin.tests.scenario.test_execute_strategies
+      tempest_exclude_regex: .*\[.*\breal_load\b.*\].*
 
 - job:
     name: watcher-tempest-multinode
@@ -255,6 +256,7 @@
       tempest_plugins:
         - watcher-tempest-plugin
       tempest_test_regex: watcher_tempest_plugin.tests.scenario.test_execute_strategies
+      tempest_exclude_regex: .*\[.*\breal_load\b.*\].*
       tempest_concurrency: 1
       tox_envlist: all
       zuul_copy_output: