Changelog for 2.54

Legend:

Community feedback:

Jenkins (controller and agents) now requires Java 8 to run. (issue 27624 , issue 42709 , pull 2802, announcement blog post)
Non-Remoting-based CLI. (issue 41745 , pull 2795, announcement blog post)
Disable SSH server by default. (issue 33595)
Use case-insensitive search by default for new and anonymous users. (issue 42645)
Introduce status indicator for skipped download job. (issue 40848)
Properly handle saving system configuration when disabling all, or all but one, administrative monitors. (issue 42852)
When validating a cron expression, consider the specified time zone. (issue 43228)