Add rules to generate server5[-badsign].crt

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/data_files/server5.crt.openssl.v3_ext b/tests/data_files/server5.crt.openssl.v3_ext
new file mode 100644
index 0000000..594e90a
--- /dev/null
+++ b/tests/data_files/server5.crt.openssl.v3_ext
@@ -0,0 +1,3 @@
+basicConstraints = CA:false
+subjectKeyIdentifier=hash
+authorityKeyIdentifier=keyid:always,issuer:always