Space in cyrus imapfolder_path
Summary:
ensure_str needed see cyruslib handling
else string is compared with bytes and the imapfolder won't be verified
Test Plan: tested with dm DELETED* on buster with python 2.7 and 3.x
Reviewers: PyKolab Developers, sicherha, mollekopf
Reviewed By: PyKolab Developers, sicherha, mollekopf
Subscribers: sicherha
Differential Revision: https://git.kolab.org/D3884