Delete dump_query() and its helper functions

There's already a function res_pquery() which can replace with
dump_query() for more detailed logs.

Logs from dump_query():
resolv  : dump_query: RECURSIVE google.com (A)

Logs from res_pquery():
resolv  : ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16075
resolv  : ;; flags: rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
resolv  : ;;	google.com, type = A, class = IN

Bug: 130686826
Test: debugging logs were printed correctly.
Change-Id: I6be7da098a4f46708b35af9539671a4428840f44