* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
#### Summary
Unfortunately, `which shadow` didn't resolve to the shadow binary, so hard-code the expected path in `$GOPATH/bin`. At the same time, run `go vet` across both the server and enterprise (if present), reducing the number of required invocations.
This is accompanied by an enterprise change to fix shadowing issues there.
#### Ticket Link
N/A (tooling upgrade)
#### Checklist
- [x] Has enterprise changes: https://github.com/mattermost/enterprise/pull/403
* Rerouted the unit test logs through t.Log
* resolving merge confilvts
* Update testing.go
* Update helper_test.go
* Added godocs for NewTestingLogger
* Added go docs for NewTestingLogger
* Resolving conflicts
* MM 10658 Change config fields to pointers (#8898)
* Change fields of config structs to pointers and set defaults
MM-10658 https://github.com/mattermost/mattermost-server/issues/8841
* Fix tests that go broken during switching config structs to pointers
MM-10658 https://github.com/mattermost/mattermost-server/issues/8841
* Apply changes of current master while switching config structs to pointers
MM-10658 https://github.com/mattermost/mattermost-server/issues/8841
* Fix new config pointer uses
* Fix app tests
* Fix mail test
* remove debugging statement
* fix TestUpdateConfig
* assign config consistently
* initialize AmazonS3Region in TestS3TestConnection
* initialize fields for TestEmailTest
* fix TestCheckMandatoryS3Fields
