Add ability to configure Heat and Trove client options

Make the client parameters "ca_file", "cert_file" "insecure" and
"key_file" configurable for Heat client and Trove client.
Partial-Bug: #1263165

Change-Id: If5e1669327db91fa2e0482b429611757df21fa88
Merge "Add ability to configure Heat and Trove client options"