IB/IPoIB: Separate control from HW operation on ipoib_open/stop ndo

This patch is preparing the netdev part at the IPoIB driver to be able
to use the ipoib_options.

It deals with the two flows from the .ndo: ipoib_open and ipoib_stop.

The code is rearranged as follows:
 * All operations which deal with the hardware resources, (for example
   change QP state, post-receive etc.) are performed in one place.
 * All operations that are control oriented (like restart multicast task,
   start the reap_ah etc.) are performed in separate place.

The functions that deal with the hardware resources now located at
__ipoib_ib_dev_open for the ipoib_open flow and __ipoib_ib_dev_stop
for ipoib_stop.

Signed-off-by: Erez Shitrit <[email protected]>
Reviewed-by: Alex Vesker <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>

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