Use Java 8 Time instead of Joda in LS and any plugins.

- JRuby 9k now uses Java 8 Time classes but it still bundles Joda at an old version (2.8.2)
- The Java Event leverages the JRuby provided Joda libs.
- The Date Filter does too.
- The version of Joda in JRuby is quite old and does not have the latest tz info data and this cannot be updated using the TZUpdater tool fom Oracle.
- Times from some timezones e.g. Venezuela will be converted to UTC incorrectly because the Venezuelans changed from -4:30 to -4:00 in 2016.
- Tests that compare a Timestamp with a Ruby Date can fail as the Ruby Time holds 6 digits of fractional seconds but Joda based Timestamp only holds 3 digits of fractional seconds.

Start by tracing Joda usage in the Java Event and Date Filter, then inspect the tests comparing timestamps with Ruby Dates and timezone conversions. Done means those components use Java 8 Time classes, current timezone data is handled correctly, and the fractional-second and timezone cases pass.

Written by the indexing model from the issue text.