ipv6 neighboring can not be displayed from VM Instance

from CSIT ( eg: vpnservice_ipv6 testing):
https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-ocata-gate-stateful-oxygen/299/log_03_basic_ipv6_vpnservice.html.gz

the current IPv6 command is incorrect.
===================
Documentation:

Writes the given `text` on the remote machine and appends a newline.
Start / End / Elapsed: 20171114 00:37:04.877 / 20171114 00:37:04.893 / 00:00:00.016
00:37:04.893 INFO ip -6 neigh
00:00:00.020 KEYWORD ${output} = SSHLibrary . Read Until ${prompt}
Documentation:

Consumes and returns the server output until `expected` is encountered.
Start / End / Elapsed: 20171114 00:37:04.893 / 20171114 00:37:04.913 / 00:00:00.020
00:37:04.912 INFO BusyBox v1.20.1 (2015-05-07 14:44:59 UTC) multi-call binary.

Usage: ip [OPTIONS]

{address | route | link | tunnel | rule} {COMMAND}

ip [OPTIONS] OBJECT {COMMAND}
where OBJECT := {address | route | link | tunnel | rule}

OPTIONS := { -f[amily]

{ inet | inet6 | link }

| -o[neline] }

$
00:37:04.913 INFO ${output} = BusyBox v1.20.1 (2015-05-07 14:44:59 UTC) multi-call binary.

Usage: ip [OPTIONS]

{address | route | link | tunnel | rule}

{COMMAND}

ip [OPTIONS] OBJECT {COMMAND}

where OBJECT := {address | rout...

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this ticket is proposing to take a commit that uses a correct syntax for using ipv6 neighboring within a VM.