Multiple fixes and cleanup

Multiple fixes and cleanup

Ticket: CM-3346
Reviewed By:
Testing Done: Tested ifupdown2 sanity

- moved 'admin up' delays that we introduced recently to be
configurable via two ifupdown2.conf attributes
    # Let link master (bridges, bonds) own the link state of slaves
    link_master_slave=1

    # Delay admin state change till the end
    delay_admin_state_change=0

- reduced some redundant traversal of dependency trees

- fixed a few bugs in query check