Revert "MB-9737: New way of generating random vb UUIDs"

This reverts commit 2a673f2687afc45ced107804aca12ddfb0aceca9.

Change-Id: I4d62f370ede46e4d5359be384eca3c5de2f8af56
Reviewed-on: http://review.couchbase.org/32384
Reviewed-by: abhinav dangeti <abhinav@couchbase.com>
Tested-by: abhinav dangeti <abhinav@couchbase.com>