LU-8130 nrs: for TBF nid handling using rhashtables

LU-8130 nrs: for TBF nid handling using rhashtables

While looking at the nrs code for lnet_nid_t I saw TBF was not
using struct lnet_nid. For the first step to support large NIDs
I moved the current use of cfs_hash to rhashtables. This doesn't
complete IPv6 support but its a first step since the rhashtable
can use large NIDs. Next step will be updating tr_nids handling.

With this port I found the refcount handling to be incorrect.
Before this work I saw in the debug logs

Busy TBF object from client with NID 0@lo, with -1073741824 refs

and nrs_tbf_res_put() never cleans up struct nrs_tbf_client until
the filesystem is unmounted. With this patch we do cleanup
each nrs_tbf_client after we are done with policy. With this being
the case nrs_tbf_nid_hop_exit() should be called unless something
is wrong.

Test-Parameters: trivial testlist=sanityn
Change-Id: Iab69a16c12ed89f0694af7bcfe9158f468838ca4
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54193
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Oleg Drokin <green@whamcloud.com>