MB-100: Reverting changes on EStests

- Adding import for EsRestConnection instead

Change-Id: I5743a7d52d63fb21516657b7e09676b8a386fad6
Reviewed-on: http://review.couchbase.org/29137
Reviewed-by: abhinav dangeti <abhinav.dangeti@gmail.com>
Tested-by: abhinav dangeti <abhinav.dangeti@gmail.com>