[API] Changed, that the `get_template` API doesn't require :name argument anymore

Related:

  * elasticsearch/elasticsearch#2532
  * elasticsearch/elasticsearch#3812
  * elasticsearch/elasticsearch-rest-api-spec@4efda5d1806019c195005d72f299d7b13047b81c
[API] Improved the output of the YAML test runner

Display the test filename in verbose (default) mode.