Use ssl conf settings for raw verify_tempest_config requests

This commit enables the use of the ssl settings from the tempest
config file for making raw requests from verify_tempest_config.
Previously, there were a set of calls to get the available
api_versions from an endpoint, which is just done by making a raw get
on an unversioned endpoint, however these neglected to respect the
ssl opts from the config file.

Change-Id: I397e75311578cef8ff0710c7040984ea8adb2239
Closes-Bug: #1420280
diff --git a/tempest/cmd/verify_tempest_config.py b/tempest/cmd/verify_tempest_config.py
index 697965f..909de96 100755
--- a/tempest/cmd/verify_tempest_config.py
+++ b/tempest/cmd/verify_tempest_config.py
@@ -28,7 +28,6 @@
 
 
 CONF = config.CONF
-RAW_HTTP = httplib2.Http()
 CONF_PARSER = None
 
 
@@ -83,7 +82,11 @@
     }
     client_dict[service].skip_path()
     endpoint = _get_unversioned_endpoint(client_dict[service].base_url)
-    __, body = RAW_HTTP.request(endpoint, 'GET')
+    dscv = CONF.identity.disable_ssl_certificate_validation
+    ca_certs = CONF.identity.ca_certificates_file
+    raw_http = httplib2.Http(disable_ssl_certificate_validation=dscv,
+                             ca_certs=ca_certs)
+    __, body = raw_http.request(endpoint, 'GET')
     client_dict[service].reset_path()
     body = json.loads(body)
     if service == 'keystone':