Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55801
Add the ability to use a custom SSLContext when creating client wss connections.
Patch provided by Maciej Lypik.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1548962 13f79535-47bb-0310-9956-ffa450edef68