Add tempest tests for shared zones

This patch adds API and scenario test coverage for the shard zones
feature.

Author: Igor Malinovskiy <u.glide@gmail.com>
Co-Authored-By: Sergey Drozdov <sergey.drozdov.dev@gmail.com, sergey.drozdov93@thehutgroup.com>
Co-Authored-By: Michael Johnson <johnsomor@gmail.com>

Change-Id: I53a1e4676c5bbb63bee0c4bb91eac03c95dd3a3c
Partial-Bug: #1714088
Depends-On: https://review.opendev.org/726334
diff --git a/requirements.txt b/requirements.txt
index d9c89bf..2ba3e1a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,5 +5,6 @@
 dnspython>=1.16.0  # http://www.dnspython.org/LICENSE
 ddt>=1.0.1 # MIT
 oslo.serialization>=2.25.0 # Apache-2.0
+oslo.utils>=3.33.0 # Apache-2.0
 testtools>=2.2.0 # MIT
 tempest>=17.1.0 # Apache-2.0