Improve the nduser option log readability.

Before:
Nduseroptmsg(10, 40, 48, 134, 0, fe80::2a00:79e1:abc:f605%wlan0)

after:
Nduseroptmsg(family:10, opts_len:40, ifindex:48, icmp_type:134, icmp_code:0, srcaddr: fe80::2a00:79e1:abc:f605%wlan1, NdOptRdnss(type: 25, length: 5, reserved: 0, lifetime: 1209600,servers:[2001:4860:4860::6464,2001:4860:4860::64]))

Bug: 315069348
Test: TH
Change-Id: I3abfbecd53a8cc00eaed9cbac1d9fe187d265847
2 files changed