tests: Added SMTP HELP test

tests/data/test928

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+<testcase>
+<info>
+<keywords>
+SMTP
+HELP
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+214-This server supports the following commands:
+214 214 HELO EHLO RCPT DATA RSET MAIL VRFY EXPN QUIT HELP
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+smtp
+</server>
+ <name>
+SMTP HELP
+ </name>
+ <command>
+smtp://%HOSTIP:%SMTPPORT/928
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+EHLO 928
+HELP
+QUIT
+</protocol>