Opportunities to reduce duplication

[jamstooks]

• Add a BaseService class that defines the __init__ method. Maybe combine with ChunkQueryMixin...

• Remove ms_object_to_model in favor of a modelKlass property on each service so ms_object_to_model can be defined in the BaseService and simply use self.modelKlass(sane_obj). This requires separate services for separate models, unlike the combined Org and OrgType ones now.

• Clean up request_session() calls:

Move

    if not self.client.session_id:
        self.client.request_session()

into __init__ and out of access methods... ConciergeClient.__init__() or BaseService.__init__() as appropriate.

• Add a shared method for query parameter handling to the BaseService for:

    if where_params:
        query += " WHERE "
        query += " AND ".join(
            ["%s %s %s" % (p[0], p[1], p[2]) for p in where_params])