tests: Added imap STATUS command test

tests/data/test809

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+<testcase>
+<info>
+<keywords>
+IMAP
+STATUS
+CUSTOMREQUEST
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+* STATUS 809 (MESSAGES 231 UIDNEXT 44292)
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+imap
+</server>
+ <name>
+IMAP STATUS (CUSTOMREQUEST)
+ </name>
+ <command>
+imap://%HOSTIP:%IMAPPORT -u user:secret -X 'STATUS 809 (UIDNEXT MESSAGES)'
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+A001 CAPABILITY
+A002 LOGIN user secret
+A003 STATUS 809 (UIDNEXT MESSAGES)
+A004 LOGOUT
+</protocol>
+</verify>
+</testcase>