Add project files.

3rd-party/curl-7.52.1/tests/data/test871

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+<testcase>
+<info>
+<keywords>
+POP3
+SASL
+SASL AUTH PLAIN
+SASL-IR
+RFC1734
+RFC4616
+RFC5034
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+AUTH PLAIN
+REPLY AUTH +OK Login successful
+</servercmd>
+<data>
+From: me@somewhere
+To: fake@nowhere
+
+body
+
+--
+  yours sincerely
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+pop3
+</server>
+ <name>
+POP3 plain authentication with initial response
+ </name>
+ <command>
+pop3://%HOSTIP:%POP3PORT/871 -u user:secret --sasl-ir
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+CAPA
+AUTH PLAIN dXNlcgB1c2VyAHNlY3JldA==
+RETR 871
+QUIT
+</protocol>
+</verify>
+</testcase>