CBLT-312:  export LITESERV_PATH earlier so it shows up in the log

Change-Id: I5d80afaff5f99c16b49240117a2839e0f34c4153
Reviewed-on: http://review.couchbase.org/38163
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>