various: Consistently switch Java to v11

The latest Jenkins releases support only Java 11 (on the server side, and
thus on the build agent side, as the versions should match).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I29fb695171e96dff5dc61d94bdebc0588a2bf577
3 files changed