Fix packer validation failures.
Merge pull request #269 from juliandunn/validation-failures

Fix packer validation failures.
Bump version from 11.1 to 11.2. Increase memory to meet minimum
requirements. Use ~vagrant instead of hardcoded /home/vagrant to
deal with peculiarities of OSes like Solaris for where the home
directories are placed by default (/export/home versus /home)
Fix syntax and typo share_folder -> synced_folder of console message.
Merge pull request #272 from jevonearth/master

Fix syntax and typo share_folder -> synced_folder of console message.
Upgrade CentOS 5 to 5.11
Merge pull request #274 from eshamow/upgrade_centos_5

Upgrade CentOS 5 to 5.11