add Multiple Vagrant configuration

Ubuntu Trusty amd64
CentOS 6.5 amd64

* temporary disable ansiple provisioning.
rewrite Rakefile and spec_helper
rewrite spec_helper
refactor playbook
split playbook redhat ver. and ubuntu ver.
spec refactor done.
split upgrade-server role
add addtional yumrepo spec
dry
Merge branch 'multiple-vm-spec'