Adds setting to disable SSL cert validation

* Breakout of prior large patchset. This patch only adds the
  configurability of SSL cert validation in all the clients.

Change-Id: I48385eabd617d19705f3f2bff4820566547be56d
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 3cbe1b5..d12da44 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -7,6 +7,9 @@
 # custom Keystone service catalog implementation, you probably want to leave
 # this value as "identity"
 catalog_type = identity
+# Ignore SSL certificate validation failures? Use when in testing
+# environments that have self-signed SSL certs.
+disable_ssl_certificate_validation = False
 # Set to True if your test environment's Keystone authentication service should
 # be accessed over HTTPS
 use_ssl = False