fix: correct wrong behaviors of single_load, multi_load and load APIs
fix: correct wrong behaviors of single_load, multi_load and load APIs

- fix .api.single_load cannot process ac_query option correctly and it
  cannot query w/ JMESPath expression actually
- fix .api.single_load trying to validate even if it was called from
  .api.multi_load or .api.load and the data it loaded was partial and
  might fail to validate
- make .api.multi_load and .api.load validates the result only once

ssato/python-anyconfig,ssato/python-anyconfig