tests: Use only 1 IMAP connection by default

We don't want to hammmer IMAP servers for the test series too much
to avoid being locked out. We will need a few tests to test
concurrent connections, but by default one connection should be fine.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

test/OLItest/globals.py

@@ -33,5 +33,7 @@ localfolders =
 
 [Repository IMAP]
 type=IMAP
+# Don't hammer the server with too many connection attempts:
+maxconnections=1
 folderfilter= lambda f: f.startswith('INBOX.OLItest')
 """)