revisit LS' Java (collection) integration patches

[kares]

at this point LS likely relies on some of the patches such as being able to + on java.util.List instances (just like one can + Ruby arrays). however, some of the patches might be supported by JRuby natively.
(also JRuby 9.3 should introduce native support for inspect-ing Java types such as collections)

the patches should work with Ruby extended Java classes such as this one, atm coll#inspect fails:
TypeError: no implicit conversion of LogStash::Outputs::TestSink::Queue into Array
(from org/logstash/RubyJavaIntegration.java:218:in inspect'`)

HINT: JRuby 9.3 should provide inspect for all Java collection types