* Closes#5863
The "dateLibrary" option for java, sadly, sets a mustache value "java8". This change updates this so that "java" in the mustache
libraries means what it should mean - use all java8 classes. In this case, there's no need for the third party Base64 library
as java8's JDK has this built in. In my view, the "dateLibrary" should be deprecated but that should be a separate PR.
* updated samples
* fixed tests for new CLI java8
* regenerated samples after master merge
* oops - left in an end tag after master merge
* rerun checks
* rerun checks
* update dep for java jersey1, jersey2
* update sbt dependency for jersey2
* update dep for java okhttp-gson, resteasy, resttemplate
* update dep for java retrofit 1.x, 2.x
* update java petstore samples
