Remove -p from oc exec in end-to-end, since it's deprecated

test/end-to-end/core.sh

@@ -460,7 +460,7 @@ os::log::info "Validating exec"
 frontend_pod=$(oc get pod -l deploymentconfig=frontend --template='{{(index .items 0).metadata.name}}')
 # when running as a restricted pod the registry will run with a pre-allocated
 # user in the neighborhood of 1000000+.  Look for a substring of the pre-allocated uid range
-os::cmd::expect_success_and_text "oc exec -p ${frontend_pod} id" '1000'
+os::cmd::expect_success_and_text "oc exec ${frontend_pod} id" '1000'
 os::cmd::expect_success_and_text "oc rsh pod/${frontend_pod} id -u" '1000'
 os::cmd::expect_success_and_text "oc rsh -T ${frontend_pod} id -u" '1000'