[COOK-2477] ensure EPEL repo is configured on EL <= 5

`rpmdevtools` (a required package) is only available from EPEL on
CentOS 5.x. We shouldn't make any assumptions that it has been
configured by another recipe/role.
fix for [FC023] - prefer conditional attributes
add `test-kitchen` 1.0 support

The 1.0 branch of test-kitchen is based on Fletcher Nichol's excellent
Jamie CI codebase.