Race condition clearing bit vectors that are already clear in Init.init.

Race condition clearing bit vectors that are already clear in Init.init.

There's no point to clear the bit vectors in SharedArbiterP.Init.init,
because the compiler guarantees they are already clear, see BitVectorC.nc.
However, manually clearing them can create a situation where someone requesting
a shared resource has their requesting bit erased, depending upon the order of
calls to Init.init providers during boot.