Cleanup HostingServiceClient documentation & API
Review Request #8912 - Created April 22, 2017 and submitted
HostingServiceClientclient class as largely undocumented: it
contained no argument or return type docs. This has been corrected.
Several of its methods also had mutable defaults, which has been
Noneso that the values do not persist to other calls.
_build_form_datamethod has been made public and static, since it
should never have to access instance variables to do the serialization
of the provided data and is a generally useful method outside the class.
- Ran unit tests.
- Built the docs and read through them.