Add a TLS scenario using Barbican

This patch adds a TLS load balancer scenario test using Barbican.

Story: 1627383
Task: 5149

Change-Id: I7013888f94261d94e1cd4c3167dc84da7125d1da
diff --git a/requirements.txt b/requirements.txt
index 5b1b3ee..815be94 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,13 +2,17 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
+cryptography>=2.1 # BSD/Apache-2.0
 python-dateutil>=2.5.3 # BSD
 ipaddress>=1.0.17;python_version<'3.3' # PSF
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
+octavia-lib>=1.0.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.log>=3.36.0  # Apache-2.0
 oslo.utils>=3.33.0  # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
+python-barbicanclient>=4.5.2 # Apache-2.0
+pyOpenSSL>=17.1.0 # Apache-2.0
 requests>=2.14.2  # Apache-2.0
 six>=1.10.0 # MIT
 tempest>=17.1.0 # Apache-2.0