don't use --private-users=pick

• enforce use_host_resolv

• require even nosync.i686

• [rpmbuild] ansible_python_interpreter: /usr/bin/python3

• [rpmbuild] install dnf-utils instead of yum-utils on Fedora
• [rpmbuild] builder: document some of the requires
• [rpmbuild] builder: merge dependencies from playbooks
• [rpmbuild] don't define %_disable_source_fetch
• [rpmbuild] use six.moves.urllib.parse
• [rpmbuild] download srpm/spec if url contains query string