make use of itertools.izip (lazy) instead of zip (strict) in myrepo.actions.deploy_built_rpms.prepare_0
only create symlinks if needed (repo is multiarch) in myrepo.actions.deploy_built_rpms.prepare_0
add one more alias, rpmkit.utils.concat in myrepo.utils
make order of prepared command strings kept when concatenating list of command strings in myrepo.actins.deploy_built_rpms.prepare
add a simple test case for myrepo.actins.deploy_built_rpms.prepare