btest/core: Add event-trace test

testing/btest/Baseline/core.event-trace/.stderr

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+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.

testing/btest/core/event-trace.zeek

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+# @TEST-DOC: Verify the --event-trace feature works and produces the same logs as when reading from a pcap.
+#
+# Trace files produced with ZAM don't work - issue #4478
+#
+# @TEST-REQUIRES: test "${ZEEK_ZAM}" != "1"
+#
+# @TEST-EXEC: zeek --event-trace trace.zeek -b -r $TRACES/http/get.trace %INPUT
+# @TEST-EXEC: mkdir pcap-logs
+# @TEST-EXEC: zeek-cut -m < http.log > pcap-logs/http.log
+# @TEST-EXEC: rm -v *.log
+#
+# @TEST-EXEC: zeek -b --parse-only %INPUT trace.zeek
+# @TEST-EXEC: zeek -b %INPUT trace.zeek
+# @TEST-EXEC: mkdir trace-logs
+# @TEST-EXEC: zeek-cut -m < http.log > trace-logs/http.log
+# @TEST-EXEC: rm -v *.log
+#
+# @TEST-EXEC: diff pcap-logs/http.log trace-logs/http.log
+# @TEST-EXEC: btest-diff .stderr
+
+@load base/protocols/http