LU-17475 tests: Do not pass IP to do_node in wait_nm_sync

LU-17475 tests: Do not pass IP to do_node in wait_nm_sync

If do_node() resolves to pdsh then the ':' in an IPv6 NID is
misinterpreted as specifying an rcmd module. Avoid the issue by
passing the node hostname instead of IP.

Test-Parameters: trivial
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I511308e3fb5247a85dec7f20a0ff4f3da2de4f3a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53838
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>