Enable some DNS logs in userdebug build

1. Set DNS default logging level to INFO.
2. Adjust logging level on some traces.

Output:
[Success]
resolv  : GetAddrInfoHandler::run: {100 983140 100 983140 1021 0}
resolv  : res_nmkquery: (QUERY, IN, A)
resolv  : res_nsend: used send_dg 97 terrno: 0
resolv  : doQuery: rcode=0, ancount=4

[Cache hit]
resolv  : GetAddrInfoHandler::run: {100 786532 100 983140 0 0}
resolv  : res_nmkquery: (QUERY, IN, AAAA)
resolv  : resolv_cache_lookup: FOUND IN CACHE entry=0xb4000075f51973d0
resolv  : doQuery: rcode=0, ancount=1

[Error - NXDOMAIN]
resolv  : GetAddrInfoHandler::run: {100 786532 100 983140 0 0}
resolv  : res_nmkquery: (QUERY, IN, AAAA)
resolv  : res_nsend: used send_dg 104 terrno: 0
resolv  : doQuery: rcode=3, ancount=0

[Timeout]
resolv  : GetAddrInfoHandler::run: {30 983070 30 983070 0 0}
resolv  : res_nmkquery: (QUERY, IN, A)
resolv  : res_nsend: used send_dg 0 terrno: 110
resolv  : res_nsend: used send_dg 0 terrno: 110
resolv  : doQuery: rcode=255, ancount=0
...

Bug: N/A
Test: m; adb logcat
Change-Id: I2a0ea2b416264d59382ef121d6d7755f8c7ffdf7