Inactive NICs in Ubuntu bootsrap

[Alexander Rubtsov]

 --- Environment ---
* MOS 9.0
* Ubuntu bootstrap image
* Nodes with several NICs

 --- Description ---
Fuel UI shows only PXE interface as active for the bootstrapped nodes

 --- Steps to reproduce ---
1. Install the Fuel master node using 9.0 ISO
2. Create a new environment
3. Boot a slave node, that have several NICs, and add it to the environment
4. Enter the "Configure Interfaces" for the slave node

 --- Actual behavior ---
All interfaces, except the one that is used for PXE/Admin network, are marked as inactive (grey) (screenshot "ui_inactive.png")

 --- Expected behavior ---
All healthy interfaces are marked as active (green)

 --- Impact ---
Such appearance might be misleading for some customers and they start wasting time to troubleshoot their nodes / networking connectivity, despite the fact that everything is fine actually

 --- Comments ---
It might be caused by settings in Ubuntu bootstrap image
There are no interfaces configured in /etc/network/interfaces
http://paste.openstack.org/show/MpyjBb9os9w6zAxs4t4a/

Therefore, Ubuntu don't bring the interfaces up during the OS boot:
http://paste.openstack.org/show/594673/

After a NIC is turned on manually by "ip link dev ethX set up", the Fuel UI starts show such NICs as active (screenshot "ui_active.png")