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- Provide a function to add and delete IPv4/IPv6 addresses
  using netlink.
- Provide a function that clears all IP addresses on an
  interface that can be used by netd.

Also, a couple of cleanups:

- Update the header file to match reality, and include the
  header file in the implementation. Also fix a caller that
  has an incorrect method signature.
- Fix whitespace in Android.mk.

Change-Id: Ifba9d60cdfffb0b7e5c3b9c6ab328f5f77d259c4

Change-Id: I353906d220382a1f5d9aad689e3927fd3dbc91d2

Change-Id: I52b3336a66224c9ae19a4c80cc706890742d4130
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

- adds ifc_set_hwaddr
- adds hwaddr command to netcfg
- code reuse: dhcp_configure calls ifc_configure; inet_ntoa is used for printing
- consistency: use net.XXX.dnsX properties in favor of dhcp.XXX.dnsX properties
  (see related change to WifiStateTracker)
- updated system/core/nexus to use new headers, although not sure if
anybody still uses nexus

Change-Id: Idd70c0ac6e89b38e86816578c33eff805d30cac4

This reverts commit c88e09cb.

- adds ifc_set_hwaddr
- adds hwaddr command to netcfg
- code reuse: dhcp_configure calls ifc_configure; inet_ntoa is used for printing
- consistency: use net.XXX.dnsX properties in favor of dhcp.XXX.dnsX properties
  (see related change to WifiStateTracker)
- updated system/core/nexus to use new headers, although not sure if
anybody still uses nexus

Change-Id: Idd70c0ac6e89b38e86816578c33eff805d30cac4