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

vendor/github.com/mattermost/gorp/CONTRIBUTING.md

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+# Contributions are very welcome!
+
+## First: Create an Issue
+
+Even if your fix is simple, we'd like to have an issue to relate to
+the PR.  Discussion about the architecture and value can go on the
+issue, leaving PR comments exclusively for coding style.
+
+## Second: Make Your PR
+
+- Fork the `master` branch
+- Make your change
+- Make a PR against the `master` branch
+
+You don't need to wait for comments on the issue before making your
+PR.  If you do wait for comments, you'll have a better chance of
+getting your PR accepted the first time around, but it's not
+necessary.
+
+## Third: Be Patient
+
+- If your change breaks backward compatibility, this becomes
+  especially true.
+
+We all have lives and jobs, and many of us are no longer on projects
+that make use of `gorp`.  We will get back to you, but it might take a
+while.
+
+## Fourth: Consider Becoming a Maintainer
+
+We really do need help.  We will likely ask you for help after a good
+PR, but if we don't, please create an issue requesting maintainership.
+Considering how few of us are currently active, we are unlikely to
+refuse good help.