smtp: add test for cmd after long line w LF

diff --git a/tests/smtp-bug-5989/README.md b/tests/smtp-bug-5989/README.md
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+# Test Description
+
+This test shows that currently the command followed by a long line (>4k) is skipped even
+if it has LF. This is incorrect.
+
+## PCAP
+
+Locally modified.
+
+## Related issues
+
+https://redmine.openinfosecfoundation.org/issues/5989

diff --git a/tests/smtp-bug-5989/input.pcap b/tests/smtp-bug-5989/input.pcap
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Binary files /dev/null and b/tests/smtp-bug-5989/input.pcap differ

diff --git a/tests/smtp-bug-5989/test.yaml b/tests/smtp-bug-5989/test.yaml
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+min-version: 7
+
+args:
+- -k none
+- --simulate-ips
+
+checks:
+- filter:
+    count: 1
+    match:
+      event_type: smtp
+      smtp.helo: "Percival"