team: add IPv6 to teamd ports when nsna_ping linkwatch is used (bsc#959556)

[rtorrero]

When nsna_ping link watcher is used, we have to enable IPv6 on the ports, as this mechanism uses IPv6 ND protocol. This PR takes care of that.

[mtomaschewski]

OK, works fine for me:

# cat ifcfg-eth1
USERCONTROL='no'
STARTMODE='hotplug'
BOOTPROTO='none'
# cat ifcfg-eth2
USERCONTROL='no'
STARTMODE='hotplug'
BOOTPROTO='none'
LLADDR='00:13:3b:0d:cd:6d'
# grep -v ^# ifcfg-team0 
STARTMODE='auto'
BOOTPROTO='dhcp4'
TEAM_RUNNER='activebackup'
TEAM_PORT_DEVICE_0='eth2'
TEAM_PORT_DEVICE_1='eth1'
TEAM_LW_NAME='ethtool'
TEAM_LW_ETHTOOL_DELAY_UP='10'
TEAM_LW_ETHTOOL_DELAY_DOWN='10'
# ip a s eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:13:3b:0d:cd:6d brd ff:ff:ff:ff:ff:ff
# ip a s eth2
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:13:3b:0d:cd:6d brd ff:ff:ff:ff:ff:ff
# ip a s team0
8: team0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:13:3b:0d:cd:6d brd ff:ff:ff:ff:ff:ff
    inet 172.20.31.161/24 brd 172.20.31.255 scope global team0
       valid_lft forever preferred_lft forever
    inet6 fe80::213:3bff:fe0d:cd6d/64 scope link 
       valid_lft forever preferred_lft forever
# grep -v ^# ifcfg-team0 
STARTMODE='auto'
BOOTPROTO='dhcp4'
TEAM_RUNNER='activebackup'
TEAM_PORT_DEVICE_0='eth2'
TEAM_PORT_DEVICE_1='eth1'
TEAM_LW_NAME=nsna_ping
TEAM_LW_NSNA_PING_TARGET_HOST=fe80::6454:ff:fe31:1
TEAM_LW_NSNA_PING_INTERVAL=10
TEAM_LW_NSNA_PING_INIT_WAIT=10000
IPADDR6=2001:db8:514f:3100::13/64
# wicked ifreload team0
team0           up
# ip a s team0
9: team0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:13:3b:0d:cd:6d brd ff:ff:ff:ff:ff:ff
    inet 172.20.31.161/24 brd 172.20.31.255 scope global team0
       valid_lft forever preferred_lft forever
    inet6 2001:db8:514f:3100::13/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::213:3bff:fe0d:cd6d/64 scope link 
       valid_lft forever preferred_lft forever
# ip a s dev eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master team0 state UP group default qlen 1000
    link/ether 00:13:3b:0d:cd:6d brd ff:ff:ff:ff:ff:ff
    inet6 fe80::213:3bff:fe0d:cd6d/64 scope link 
       valid_lft forever preferred_lft forever
# ip a s dev eth2
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master team0 state UP group default qlen 1000
    link/ether 00:13:3b:0d:cd:6d brd ff:ff:ff:ff:ff:ff
    inet6 fe80::213:3bff:fe0d:cd6d/64 scope link 
       valid_lft forever preferred_lft forever