move wire_test back to bin/tests, no longer dependent on dnstap

move wire_test back to bin/tests, no longer dependent on dnstap

wire_test is not only used by the dnstap system test, but also in
fuzz testing. it doesn't need to be installed, but it's useful to have it
built when BIND is.  this commit moves it back from bin/tests/system to
bin/tests, as a noinst_PROGRAM so that it's built by "make all" but
not installed.