Adding error message output to KVM connection failures

Changes:
    * Adding message to template
    * Changing status to be the exception message on connection failures

When I was setting the app up, I had a hell of a time figuring out why the app failed to connect to my KVM hosts even though I followed the linked guide. After adding the included commits to my clone, I was able to determine that it was SELinux blocking my socket connection attempt, thereby preventing it from working. The commits included just help with usability -- they don't change any real functionality.