* 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-10458] Change system response to "Could not find the channel" when trying to invite user to private channel you can't see
* add another check to check if user have permission to add another in pvt channel