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Setting env var `BROWSER_PROVIDER` to `browserstack` or `saucelabs`
determines which browser provider will be used.
This does not affect the build as all jobs are set to use SauceLabs.
Switch to Karma with Socket.io 1.x, which solves some issues(*) with BS.
Thus removing `config.transports` as it is not used anymore
(Socket.io 1.x starts with polling and tries to upgrade if available).
(*) folks from BS were fiddling with socket.io configuration to get it stable.
See 4c04011850
This is not necessary with Socket.io 1.x.