Centralize nvme controller reset, delete and fabrics periodic reconnects

[Sagi Grimberg]

>> Sure, should I have it on top of the affinity patches or not?
> 
> For now get any tree you have out to take a look.  In the longer
> run we'll need to decide how we want to deal with the merge
> of the two trees.  In general having to depend on the RDMA
> tree is a major risk because it's maintainance is so unreliable.

Its really a small conflict, easy enough to get it without. The problem
that no matter what I do, one tree would conflict...

> If it's in a branch of its own we could pull it in through and
> send that bit through both trees.

We can do that, should I use the nvme tree for that? or maybe once we
converge on the patch set?