scheduler: add missing copyright

#

#  Copyright (C) 2018 Codethink Limited

#

#  This program is free software; you can redistribute it and/or

#  modify it under the terms of the GNU Lesser General Public

#  License as published by the Free Software Foundation; either

#  version 2 of the License, or (at your option) any later version.

#

#  This library is distributed in the hope that it will be useful,

#  but WITHOUT ANY WARRANTY; without even the implied warranty of

#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

#  Lesser General Public License for more details.

#

#  You should have received a copy of the GNU Lesser General Public

#  License along with this library. If not, see <http://www.gnu.org/licenses/>.

#

#  Authors:

#        Tristan Maat <tristan.maat@codethink.co.uk>

from .elementjob import ElementJob

from .cachesizejob import CacheSizeJob

from .cleanupjob import CleanupJob