HTTPCLIENT-1587 Document default Oracle JSSE restriction: SSLContext#init only uses first instance of managers

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Immutable private field might as well be final

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/branches/4.3.x@1644067 13f79535-47bb-0310-9956-ffa450edef68