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Add "wait_for_kill" to process_manager to avoid join() stalling forever
Make sure to not stall (just in case)
Fix regression in url encoded salt-api messages

Most clients that do url encoding include other data in the Content-Type field (requests for example sets "application/x-www-form-urlencoded; charset=utf-8"). This changes the api to be a more forgiving server which will make any non-list struct a list
Make this a debug line, we see it a lot and don't really care :)
Merge pull request #15849 from jacksontj/develop

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