Upgrade compilers on centos-7 kitchen tests
Upgrade compilers on centos-7 kitchen tests

Fixes the centos-7/oraclelinux-7 tests, also fixes centos-6 and
gets off of vault.centos.org

Signed-off-by: Lamont Granquist <0ab8dc438f73addc98d9ad5925ec8f2b97991703@scriptkiddie.org>

chef/chef,gene1wood/chef,tas50/chef-1,chef/chef,gene1wood/chef,chef/chef,tas50/chef-1,gene1wood/chef,gene1wood/chef,tas50/chef-1,tas50/chef-1,chef/chef