ui: give editor() a tag of its own
We know that calls to ui.editor() always block on the user's configured editor.
Use a blocking tag that ensures that we don't see a huge variety of editor
options in our logging.
FROM centos:centos5
RUN yum install -y gcc make rpm-build gettext tar
RUN yum install -y python-devel python-docutils
# For creating repo meta data
RUN yum install -y createrepo
RUN yum install -y readline-devel openssl-devel ncurses-devel zlib-devel bzip2-devel