Mb-12196: Remove warning message

Since snappy module is not part of current release, remove the warning
message for the time being

Change-Id: Ib061434102f4ed5d43b1ddb90afb1c14d0c0123b
Reviewed-on: http://review.couchbase.org/41514
Reviewed-by: Bin Cui <bin.cui@gmail.com>
Tested-by: Bin Cui <bin.cui@gmail.com>