Remove from_chassis/from_nodes from the API doc

The flags from_chassis/from_nodes are internal flags and are used
to indicate whether the requests coming to the controller are
coming from the top-level resource and so prevent some actions like
creating/deleting/updating a resource to happen, this flags were being
passed to the class constructor and were appearing in the auto-generated
API documentation as a misleading parameter that could be passed as part
of the resource URI.

This patch is removing those flags from the class constructors.

Closes-Bug: #1329389
Change-Id: I6b6ba2ab303fb485350f52569539ac405ec5ade3