add query ID to the query trace message

add query ID to the query trace message

Adding the query ID to the query trace message. The log is now as the
following (id is at the end):

    query client=0x7f75c5017000 thread=0x7f75c6dfe680(foo.fr/A): \
      client attr:0x22300, query attr:0x700, restarts:0, \
      origqname:foo.fr, timer:0, authdb:0, referral:0, id:21338

This should help debugging tests, in particular to quickly get a
specific query from the logs.