objectmodel: removed unused hwaddr interface property
hwaddr: set link-address on ethernet,vlan,macvlan
mtu: skip if up, limit it to mtu of lower device

- Use separate calls to set the mtu and the link up
- Do not allow to set higher mtu than on lower device.
- Do not set, when interface is already UP (->reload);
  it causes busy errors and breaks upper interfaces.
compat: process ethtool options ifcfg variable
ibft: workaround missed readlink, modprobe on request
ibft: added list-only mode to extensions/ibft
ibft: correctly apply modprobe option defaults
compat: check ethernet pointer before generating
client: Improve initialization of client-state structure

- Split ni_fsm_get_matching_workers() and ni_fsm_mark_matching_workers()
- Introduce new type ni_ifmarker_t to mark specific attributes of
  ifworkers (target_range, persistent)
- get rid of ni_fsm_set_client_state() and move the functionality to
  ni_ifworker_start() - possible due to the above split
- Introduce macro to carefully set control flags like persistent
Merge pull request #146 from pwieczorkiewicz/client_state_1
Merge pull request #147 from mtomaschewski/hwaddr-change
Merge pull request #148 from mtomaschewski/ibft