This patch moves bond slave link ownership to the bond module and makes

This patch moves bond slave link ownership to the bond module and makes
sure that slaves can never be brought admin up on their own when they
are not in the bond

Ticket: CM-4408
Reviewed By: CCR-2323
Testing Done: Tested ifup/ifdown of bond slaves and bond interface

This patch introduces:
- introduces 2 interface flags, LINK_MASTER and LINK_SLAVE.
- The bond module will set LINK_MASTER on the bond iface object
indicating that the bond module owns the link.
- Which means that all lower devices /slaves of the bond get their
link when the bond (aka LINK_MASTER) is processed in the bond module
- The module that queries dependencies propagates the LINK_SLAVE flags
on the dependents of LINK_MASTER.
- The scheduler now acts on the LINK_SLAVE flag. If LINK_SLAVE is set,
it skips setting admin 'up' on that interface. It also makes sure the
interface is not already in the bond.
    ie if an interface is a LINK_SLAVE (bond slave in this case), admin
up will not be executed when the interface is not inside the bond.