Add support to enable/disable installation of recommended packages
for dnf package manager. With this commit 'plusRecommended'
patternType triggers on installation of recommended packages, which
is turned off by default.
With this commit package manager are always set to include only
required packages or set to include required and recommended
packages.
This commit fixes#285
The request_package_lock was renamed into request_package_exclusion
because that is the goal, to actually exclude(skip) a package. From
an implementation point of view this is done to set a lock in the
zypper case. However other package managers might do it differently.
The interface should stay consistent with regards to the user goal
and not with the package manager specific implementation. This
Fixes#248
DNF is the package manager used on Fedora systems and will also most
likely replace yum for the next generation of RHEL. Along with the
implementation here an example JeOS image description for Fedora can
be found on: https://github.com/SUSE/kiwi-descriptions.
This Fixes#36
