Revert "MB-7797: Lower bgfetch sleep time for 60s to 1s"

This reverts commit 62717fadb0f59cf50396908845625a4142b4a44f.

Change-Id: Idc9c18e12bac55be552e4fd32baa5f839dc3b145
Reviewed-on: http://review.couchbase.org/24901
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>