BpfCoordinator: change function name and format for dumping IPv6 rules

Current function naming is confusing.
dumpIpv6ForwardingRules dumps Java map.
dumpIpv4ForwardingRules dumps BPF map.

Change related function name and minor output string format.

Test: adb shell dumpsys tethering
Forwarding rules:
  IPv6 Forwarding rules by downstream interface:
    [ap_br_wlan2]: iif(iface) oif(iface) v6addr [srcmac] [dstmac]
      15(rmnet1) 54(ap_br_wlan2) 2401:e180:8d60:9943:a550:fafd:1644:14b6 [d6:bb:b4:95:3c:58] [52:5c:cf:fc:c6:ff]
  IPv6 Upstream: iif(iface) [inDstMac] -> oif(iface) etherType [outSrcMac] [outDstMac]
    54(54) [d6:bb:b4:95:3c:58] -> 15(rmnet1) 86dd [00:00:00:00:00:00] [00:00:00:00:00:00]

Change-Id: I27bdb5d8f3773789f8dcce63e9a33c4316d8048b
1 file changed