PLT-6341/PLT-6342 Update gorp to mattermost fork and add connection timeout setting (#6410)

* Update gorp to mattermost fork and add connection timeout setting

* Add go dependency

* Rename from connection timeout to query timeout

* Properly add gorp dependency

store/sql_channel_store.go

@@ -11,7 +11,7 @@ import (
 	"strings"
 
 	l4g "github.com/alecthomas/log4go"
-	"github.com/go-gorp/gorp"
+	"github.com/mattermost/gorp"
 	"github.com/mattermost/platform/einterfaces"
 	"github.com/mattermost/platform/model"
 	"github.com/mattermost/platform/utils"