SERVER-29642 SERVER-29643 Add Python tests for test lifecycle scripts.

For test_failures.py:
  * Replaces HistoryReport with a TestHistory class that has
    get_history_by_revision() and get_history_by_date() methods. They
    both return a list of ReportEntry tuples that can be used to
    construct a Report instance.
  * Adds Python unit test cases for the Report and ReportEntry classes.
  * Creates Wildcard class as separate concept from Missing class.
  * Enables --sinceDate and --untilDate with a warning that the script
    may not return a complete result set.
  * Adds support for running the script with Python 3.

For update_test_lifecycle.py:
  * Introduces Config namedtuple to represent the test lifecycle model.
  * Adds Python unit tests cases for the update_tags() function.
  * Takes advantage of the partial grouping so that computing summaries
    for (test, task, variant), (test, task), and (test,) combinations do
    not require re-processing the entire result set.

1 files changed, 1 insertions, 1 deletions

diff --git a/buildscripts/resmokelib/selector.py b/buildscripts/resmokelib/selector.py
index a3448116efb..e1cec945603 100644
--- a/buildscripts/resmokelib/selector.py
+++ b/buildscripts/resmokelib/selector.py
@@ -28,7 +28,7 @@ def _parse_tag_file(test_kind):
     a list of tags, i.e., {'file1.js': ['tag1', 'tag2'], 'file2.js': ['tag2', 'tag3']}
     """
     if config.TAG_FILE:
-        tags_conf = _tags.TagsConfig(config.TAG_FILE)
+        tags_conf = _tags.TagsConfig.from_file(config.TAG_FILE)
         tagged_roots = tags_conf.get_test_patterns(test_kind)
     else:
         tagged_roots = []