Upgrade CentOS 5 to 5.11
Merge pull request #274 from eshamow/upgrade_centos_5

Upgrade CentOS 5 to 5.11
Updated Oracle Enterprise Linux definitions to 5.11
Merge pull request #275 from juliandunn/oel511

Updated Oracle Enterprise Linux definitions to 5.11
Updated RHEL to 5.11.
Merge pull request #276 from juliandunn/rhel511

Updated RHEL to 5.11.