Make the Python generator use non-hardcoded namespaces.

- Make the Python generator use program->get_namespace("py")
  instead of program->get_py_module()
- Eliminate the explicit "py_module" in t_program.
- Deprecate the py_module token.
- Update example .thrift files and syntax files.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665615 13f79535-47bb-0310-9956-ffa450edef68
6 files changed