ocaml: test: refactor the request parser tests
ocaml: test: refactor the request parser tests

xapi-project/message-switch,djs55/message-switch-1,djs55/message-switch,xapi-project/message-switch,xapi-project/message-switch,djs55/message-switch-1,djs55/message-switch-1,djs55/message-switch,djs55/message-switch