test815/816: Use authentication for both URLs

The improved connection reuse logic would otherwise create a new
connection for each one, which isn't supported by the test
server, nor expected by the test.

tests/data/test815

@@ -26,7 +26,7 @@ imap
 IMAP STORE - delete message (CUSTOMREQUEST)
  </name>
  <command>
-imap://%HOSTIP:%IMAPPORT/815 -X 'STORE 123 +Flags \Deleted' -u user:secret -: imap://%HOSTIP:%IMAPPORT/815 -X CLOSE
+imap://%HOSTIP:%IMAPPORT/815 -X 'STORE 123 +Flags \Deleted' -u user:secret -: imap://%HOSTIP:%IMAPPORT/815 -X CLOSE -u user:secret
 </command>
 </client>
 

tests/data/test816

@@ -29,7 +29,7 @@ imap
 IMAP STORE - delete message with confirmation (CUSTOMREQUEST)
  </name>
  <command>
-imap://%HOSTIP:%IMAPPORT/816 -X 'STORE 123 +Flags \Deleted' -u user:secret -: imap://%HOSTIP:%IMAPPORT/816 -X EXPUNGE
+imap://%HOSTIP:%IMAPPORT/816 -X 'STORE 123 +Flags \Deleted' -u user:secret -: imap://%HOSTIP:%IMAPPORT/816 -X EXPUNGE -u user:secret
 </command>
 </client>