Upgrade HC4 to latest (4.3.2)

Seems no code change is needed.

Notable HC4.3.x changes:
* Support for Java 7 try-with-resources for resource management (connection release.)
* Added fluent Builder classes for HttpEntity, HttpRequest, HttpClient and SSLContext instances.
* Reliance on object immutability instead of access synchronization for thread safety.
* HttpClient builders now dynamically construct a request execution pipeline tailored specifically to the user configuration by physically excluding unnecessary protocol components.
* SNI support for Oracle JRE 1.7+ (since 4.3.2)

For full list see: http://hc.apache.org/news.html

CI
https://bamboo.zion.sonatype.com/browse/NX-OSSF0