Implement SMTP authentication

tests/data/test806

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+<testcase>
+<info>
+<keywords>
+SMTP
+SMTP AUTH LOGIN
+RFC4954
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+REPLY EHLO 220 AUTH LOGIN
+REPLY AUTH 334 UGFzc3dvcmQ6
+REPLY MTIzNA== 235 Authenticated
+</servercmd>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+smtp
+</server>
+ <name>
+SMTP login authentication
+ </name>
+<stdin>
+mail body
+</stdin>
+ <command>
+smtp://%HOSTIP:%SMTPPORT/user --mail-rcpt 806@foo --mail-from 806@from -u test:1234 -T -
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+EHLO user
+AUTH LOGIN dGVzdA==
+MTIzNA==
+MAIL FROM:806@from
+RCPT TO:<806@foo>
+DATA
+QUIT
+</protocol>
+<upload>
+mail body
+
+.
+</upload>
+</verify>
+</testcase>