Also fixes v2.3 download link

Fixes several minor bugs uncovered by error prone.
Offset timezones are correctly parsed rather than using GMT.

initializing itself.

properties, user name, and password.

properties, user name, and password.

[BUILD] removed picocli tests from core tests; they do not add value here and occasionally fail when building Log4j on a console that supports ANSI colors

(cherry picked from commit dd8ded97)

oracle.xml.jaxp.JXDocumentBuilderFactory.

allowed for MongoDB tests to be disabled if not running on Java 8. This
was due to the dependency on Java 8 of the MongoDB test framework we
use.

SecurityManager that rejects system property access. This test passes
for me on Windows 10 but fails on Jenkins. Reorder a sanity check so
that it takes place before the SecurityManager test rule is evaluated.

SecurityManager that rejects system property access.

SecurityManager that rejects system property access.

SecurityManager that rejects environment variable access.