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* change MessageWillBePosted nil return semantics
* change FileWillBeUploaded nil return semantics
* use LogDebug to verify plugin inputs vs. the confusing Delete(User|Team)
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Tests; gofmt
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order of files (#9170)
* set createAt timestamp on file upload api call to secure upload order of files
* fix test on plugin hooks
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* ensure plugin is always shutdown
Once we call `.client.Client()` the plugin has started, and must be shut
down. `newSupervisor` sometimes returned with an error (and without a
reference to the supervisor), leaving the client running indefinitely.
* Clarify the documentation to explain that plugin hooks will not trigger until `OnActivate` returns successfully, and will stop triggering just before `OnDeactivate` is called.
* test for plugin deadlock
* plugin/environment.go: switch to sync.Map
From: https://golang.org/pkg/sync/#Map
> If a goroutine holds a RWMutex for reading and another goroutine might call Lock, no goroutine should expect to be able to acquire a read lock until the initial read lock is released. In particular, this prohibits recursive read locking. This is to ensure that the lock eventually becomes available; a blocked Lock call excludes new readers from acquiring the lock.
The previous `RWMutex` was not safe given that we effectively acquired read locks recursively (hook -> api -> hook). This worked up until we activated or deactivated plugins, tried to acquire a write lock, and the plugin used the API to effectively trigger another hook.
Switching to sync.Map avoids this by divesting the need to lock at all, avoiding the potential for a recursive lock in the first place.
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* Adding file upload hook.
* Adding hook test for FileWillBeUploaded
* Some debugging fixes.
* Fix typo.
* Fixing double close
* Fix capitalization on docs.
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* Rearranging plugin mocks and moving some common test code out.
* Adding tests.
* Fixing tests after GoDoc cleanup changes.
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