Add code to BpfCoordinator to dump upstream IPv4 and IPv6 rules.
For IPv4, currently only the upstream map is printed, because the
downstream map is expected to be symmetrical.
Example output:
=============
21(21) -> 12(rmnet_data2) 86dd 00:00:00:00:00:00 00:00:00:00:00:00
[wlan1]: iif(iface) oif(iface) v6addr srcmac dstmac
12(rmnet_data2) 21(wlan1) /2001:240:2425:b5dc:21a9:995d:bc57:bc37 b2:b5:e0:24:21:c2 ca:06:8d:54:99:ad
[IPv4]: iif(iface) oif(iface) src nat dst
21(21) 12(rmnet_data2) 192.168.16.247:41544 -> 100.101.80.108:41544 -> 216.239.36.135:443
21(21) 12(rmnet_data2) 192.168.16.247:42028 -> 100.101.80.108:42028 -> 8.8.4.4:853
21(21) 12(rmnet_data2) 192.168.16.247:42032 -> 100.101.80.108:42032 -> 8.8.4.4:853
21(21) 12(rmnet_data2) 192.168.16.247:42042 -> 100.101.80.108:42042 -> 8.8.4.4:853
21(21) 12(rmnet_data2) 192.168.16.247:41816 -> 100.101.80.108:41816 -> 8.8.8.8:853
21(21) 12(rmnet_data2) 192.168.16.247:42040 -> 100.101.80.108:42040 -> 8.8.4.4:853
=============
Also make it possible to do "dumpsys tethering bpf" and get only
the BPF dump.
Test: manual
Change-Id: I2aaa2fdda7d724994090c26feff585f24cd3283b
61976f278f