* updated Doc strings of all classes (except IPAM_switch) with example code after getting a new Trial Appliance
* moved json from API and json from Object compare in get_json method to Baseclass as __get_json_validator__
* added methods for API object:
  - get_macid_byAddress
  - get_pdu_models
  - get_racks
  - get_assets
  - get_patch_panels