LU-12205 tests: host_nids_address() fix for MR setup

LU-12205 tests: host_nids_address() fix for MR setup

Patch fixes t-f:host_nids_address() to work properly
on multiple networks setup.

Example:
With MR setup we have:
lctl list_nids
192.168.101.3@tcp
10.0.101.3@tcp1
10.0.201.3@tcp2
For NETTYPE=tcp host_nids_address() should give the result
192.168.101.3 only.

Test-Parameters: trivial testlist=sanity,sanityn,sanity-sec,\
lnet-selftest,conf-sanity,obdfilter-survey

Signed-off-by: Elena Gryaznova <c17455@cray.com>
Cray-bug-id: LUS-7150
Reviewed-by: Alexey Lyashkov <c17817@cray.com>
Reviewed-by: Chris Horn <hornc@cray.com>
Change-Id: Ida397f1811be142c5aa8813f32461b83d6113fc2
Reviewed-on: https://review.whamcloud.com/34723
Reviewed-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>