Added data for rhel6.5
testcase_30_rhn_certificates:added 6.5 version
testcase_31_subscription_management: updated testcase to distinguish 5.x version with no pem file and 6.x with pem

updated testcase based on the fact that 6.x version has pem file so the output of 'subscription-manager list' will list installed products,unlike 5.x version that does not have pem file,so does not keep track of installed products.