Incomplete headers should not be accepted

Data-source disable operation does not supprt allow-resource-service-restart attribute (as remove does).

Steps to reproduce:
[standalone@localhost:9999 /] data-source add --name=TestDS --jndi-name=java:jboss/datasources/TestDS --driver-name=h2 --connection-url=jdbc:h2:mem:test;DB_CLOSE_DELAY=-1
[standalone@localhost:9999 /] data-source enable --name=TestDS
[standalone@localhost:9999 /] /subsystem=datasources/data-source=TestDS:disable

{allow-resource-service-restart}

{
"outcome" => "success",
"response-headers" =>

{ "operation-requires-restart" => true, "process-state" => "restart-required" }

}
[standalone@localhost:9999 /] data-source enable --name=TestDS
JBAS014749: Operation handler failed: Service jboss.data-source-config.TestDS is already registered
[standalone@localhost:9999 /]