[jruby] a couple refactorings - avoid copy-ing bytes (#2730)
[jruby] a couple refactorings - avoid copy-ing bytes (#2730)

* [jruby][refactor] avoid byte[] copy-ing

* [jruby][refactor] proper ASCII string creation

* [jruby][refactor] drop unused KeyStore instances

* [jruby][refactor] review exception handling (catch less)

* [jruby][refactor] no need to copy local byte[] array
eileencodes/puma,eileencodes/puma,puma/puma,eileencodes/puma,puma/puma,puma/puma,puma/puma,eileencodes/puma