Comment 7 for bug 1548248

Verified on MOS 7.0 + mu3 updates.

Test scenario is described above.
Result:
root@node-4:~# cat /etc/network/interfaces.d/ifcfg-br-ex
auto br-ex
iface br-ex inet static
bridge_ports bond0 p_408821a5-0 p_ff798dba-0
address 10.109.6.4/24
gateway 10.109.6.1
post-up sleep 15