Also detected failed packages in dnf/yum wrapper
Also detected failed packages in dnf/yum wrapper

As seen in [1]; dnf can output a "Failed:" section when installation
issues with a package are detected.  This does not, however, trigger
an exit failure code when running with "-y".  So add this to our
checking wrapper.

[1] http://logs.openstack.org/49/280449/1/check/gate-tempest-dsvm-platform-fedora23-nv/dc70ca8/logs/devstacklog.txt.gz#_2016-02-28_22_42_45_145

Change-Id: I12f7b3bc9e9cf5a97114082d3a634a42742843d5

openstack-dev/devstack,dtroyer/devstack,samgoon/devstack,group-policy/devstack,bigswitch/devstack,bswartz/devstack,noironetworks/devstack,nawawi/openstack,Mahito/devstack,bswartz/devstack,samgoon/devstack,nawawi/openstack,richliu/devstack,group-policy/devstack,dtroyer/devstack,openstack-dev/devstack,noironetworks/devstack,bigswitch/devstack,richliu/devstack,Mahito/devstack