Drop fedora in delorean-ci
Drop fedora in delorean-ci

Fedora updates repo is acting weird, producing situation like:
Available: 4:perl-5.20.3-328.fc22.x86_64 (updates)
Installing: 4:perl-5.22.0-349.fc23.x86_64 (fedora)

which we do not want to debug right now.

Change-Id: I2b70b9a25d9ca43f6a42fb4fd7b763cdb2fd0b5b

openstack-packages/delorean,openstack-packages/delorean,openstack-packages/DLRN,openstack-packages/DLRN