bugfix: flaky crud tests

An instance was listening on a testing port until the configuration
was complete. At the end of the configuration, the port was
reopened.

As a result, we saw connection loss in tests.

Closes #288

Author: oleg-jukovec

crud/testdata/config.lua

@@ -64,7 +64,7 @@ _G.vshard = vshard
 box.once('guest', function()
     box.schema.user.grant('guest', 'super')
 end)
-local uri = '[email protected]:3013'
+local uri = '[email protected]:3014'
 local cfg = {
     bucket_count = 300,
     sharding = {