add python-backports-lzma as a Requirement for py2 in spec file
add python-backports-lzma as a Requirement for py2 in spec file

DBuildService/atomic-reactor,projectatomic/atomic-reactor,fr34k8/atomic-reactor,fatherlinux/atomic-reactor,david-martin/atomic-reactor,jarodwilson/atomic-reactor,fatherlinux/atomic-reactor,jpopelka/atomic-reactor,jarodwilson/atomic-reactor,jpopelka/atomic-reactor,vrutkovs/atomic-reactor,fr34k8/atomic-reactor,maxamillion/atomic-reactor,david-martin/atomic-reactor,vrutkovs/atomic-reactor,DBuildService/atomic-reactor,maxamillion/atomic-reactor,projectatomic/atomic-reactor