python-virtinst bug fix and enhancement update on RHEL6

python-virtinst bug fix and enhancement update
https://rhn.redhat.com/errata/RHBA-2014-1444.html

Updated python-virtinst package that fixes several bugs and add various
enhancements are now available for Red Hat Enterprise Linux 6.

virt-install / virt-manager のBugFixとエンハンス