Fixed the usage of self signed certificates

Change-Id: I5962256da90fabd1332527d7cba422204549f7a0
Signed-off-by: Antonio Marsico <antonio.marsico@bt.com>
diff --git a/osm_mon/collector/utils/openstack.py b/osm_mon/collector/utils/openstack.py
index 3a2b1b9..2ec85be 100644
--- a/osm_mon/collector/utils/openstack.py
+++ b/osm_mon/collector/utils/openstack.py
@@ -35,7 +35,10 @@
         user_domain_name = 'Default'
         if 'config' in creds:
             vim_config = creds['config']
-            verify_ssl = False if 'insecure' in vim_config and vim_config['insecure'] else True
+            if 'insecure' in vim_config and vim_config['insecure']:
+                verify_ssl = False
+            if 'ca_cert' in vim_config:
+                verify_ssl = vim_config['ca_cert']
             if 'project_domain_name' in vim_config:
                 project_domain_name = vim_config['project_domain_name']
             if 'user_domain_name' in vim_config: