DHCP: Ethernet/IP packet header changes.
DHCP: Ethernet/IP packet header changes.

1. Support L2_ENCAP when building packets as well as when parsing.
2. Skip IP options when parsing DHCP packets.

Bug: 19704592
Change-Id: Ic27a45790ed1cf7cf5b82d63b6c0b64c909a570f

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base