The change updates the imports to use simplejson library and fixes three
unit tests. In particular TestUtils.test_parse_alarm_state_hist_message
has been slightly changed to make testing more robust.
Also, Python 2 specific implemetation has been removed from
influxdb.line_utils .
Additionally, standard library unittest.mock is used instead of the
third party mock lib.
Depends-On: https://review.opendev.org/718014
Depends-On: https://review.opendev.org/720188
Change-Id: I64b1a60e8be929c25c005a0f429b1274cb8570e6
Story: 2007549
Task: 39390
dc8956d7b8