Update gorp to support query timeouts on postgres (#6730)

* Update gorp to support query timeouts on postgres

* Update help text to remove postgres exception

* Fix glide.lock

glide.yaml

@@ -82,4 +82,4 @@ import:
 - package: gopkg.in/olivere/elastic.v5
   version: v5.0.41
 - package: github.com/mattermost/gorp
-  version: cab337059e349c91a4b917c9be50708813619543
+  version: 995ddf2264c4ad45fbaf342f7500e4787ebae84a