Release 1.16.0-RC1

Release 1.15.4

Release 1.15.3

Fixes #20241 - Fix test for mail notifications

One of the tests in test/unit/tasks/reports_test is testing for
delivery.subject =~ /Configuration Management Summary/
This made sense in develop because since #16159 mail alerts have that
subject. However on the 1.15-stable branch, it still has the old
subject, "Puppet Summary".

Release 1.15.1

Release 1.15.0

Release 1.15.0-RC2

Release 1.15.0-RC1

Release 1.14.3

Release 1.14.2