use packstack install openstak on fedora 20

rdo fix

doc from redhat.

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux_OpenStack_Platform/2/html/Getting_Started_Guide/ch05.html

1 fix can not open rdo repo error, 
 edit /etc/yum.repo.d/rdo-release.repo, change relase to 19,(cant not find repo for 20)


2 neutron_subnet does not handle empty dns servers, allocation pools and also specific host routes
get this fix,
/usr/share/openstack-puppet/modules/neutron/lib/puppet/provider/neutron_subnet/neutron.rb
git.openstack.org/cgit/stackforge/puppet-neutron/commit/?id=78428c844f73bf585a8f8a3bdf615ba2a0e8983b
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