OOIION-968

https://jira.oceanobservatories.org/tasks/browse/OOIION-968
several more adjustments while running integration tests against
actual RSN endpoint while also doing changes to reflect adjustments in interface
specification (eg platform port "is_on" attribute renamed to "state") so we keep
our simulator also up-to-date.

Please merge.  (I have other outstanding PRs and better minimize risk of conflicts..)
thx.