CBQE-1481: Non-sudo non-root automation

- Test2 - backup/restore
- conf file for centos setup automation
- ini file to have ssh_username and sshkey

Change-Id: I837e85b33d628db304c00d0dfe3f5cbf87583241
Reviewed-on: http://review.couchbase.org/28266
Reviewed-by: abhinav dangeti <abhinav.dangeti@gmail.com>
Tested-by: abhinav dangeti <abhinav.dangeti@gmail.com>