ocaml: test: add more storage interface unit tests
ocaml: test: add more storage interface unit tests

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