File sorter is no longer needed

The file sorting now happens in the incremental updater. No extra
executable is needed anymore.

Change-Id: Ie639763a59fadb31c48fc4a0ec3ab66d87918a18
Reviewed-on: http://review.couchbase.org/42829
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>