Improve the tests slightly: dataset wildcard, jsonwrapper, tests based on zip service

* fix dataset wildcard
* zip service not to fail with default config: added google_maps service to default config …
  -  it is used in unit tests, will will fix these tests from failing with default config
* json tests shall not fail if only some of the modules is not available
  - still while performing the tests, a message is printed if it's not available, but tests do not fail...
* pylint/pep8 fixes for test/jsonwrapper_t.py