Fix compilation errors against stable-3.6

* apache.commons.lang is no more available in the Gerrit dependencies.
Move to the more recent lang3 version.
* update Change lastUpdatedOn parameter to use Instant, accordingly to
new Change constructor signature [1].
* avoid to hardcode ALL as log level in the test utility.
Set the value coming from the logging event. Tests were failing since
they weren't matching the correct log level.


Bug: Issue 15842
Change-Id: I295a4f37eea2d6df0142bb8d6024d75da956a9dd
3 files changed