[FIX] bus: co-existing instances of bus.bus

Before this rev., it was not possible to have co-existing instances
of bus.bus, each one polling its own server, for several reasons.

First, the Bus class couldn't be overridden or parameterized to
specify which server and route to call to perform the longpolling.

Second, when several instances of bus.bus coexisted, their use of
the localStorage (for the CrosstabBus) conflicted, and as a result,
only one of them actually polled.

This rev. makes it possible, and it was necessary for the new addon
'im_support'.

Task 26762

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