Don't leave temporary test directories.

Issue: CLIENT-453
Change-Id: I966a5bcffd3550f8e4b23de1448ae654ed2e7380
Reviewed-on: http://gerrit.dmdirc.com/3194
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Update submodules: util (new commits)

util:
    6780ea8 Chris Smith <chris@dmdirc.com>
            Mark temp files as deleteOnExit.

            Fixes-Issue: CLIENT-453
            Gerrit: http://gerrit.dmdirc.com/3195

Change-Id: Ibd2bb55333566b0712069593d3e29b7e0e9d62ed