Merge changes I6745a615,Ic50dc122,I38729c23,I6d1da4f1,I1cef6e09, ...
* changes:
[CLATJ#16] Rename JNI/Dependencies function and improve JNI error handling
[CLATJ#15] ClatCoordinator: add socket filter to packet socket
[CLATJ#14] ClatCoordinator: add anycast to raw socket
[CLATJ#13] ClatCoordinator: open raw socket
[CLATJ#12] ClatCoordinator: open packet socket with a given mark
[CLATJ#11] ClatCoordinator: config tun interface and bring up
[CLATJ#10] ClatCoordinator: detect mtu
[CLATJ#9] ClatCoordinator: open tun interface
[CLATJ#8] ClatCoordinator: select IPv6 address with checksum-neutral IID
[CLATJ#7] ClatCoordinator: select IPv4 address for clatd
[CLATJ#6] libclat: move configure_packet_socket() from netd to apex
[CLATJ#5] libclat: move detect_mtu() from netd to apex
[CLATJ#4] libclat: move selectIpv4Address() and isIpv4AddressFree() from netd to apex
[CLATJ#3] libclat: move generateIpv6Address() from netd to apex
[CLATJ#2] libclat: Add libclat_test to postsubmit
[CLATJ#1] libclat: move makeChecksumNeutral() from netd to apex