[LOG4J2-644] Implement a secure SocketAppender and secure server (SSL/TLS). Merge the SecureSocketAppender into the existing SocketAppender.


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1596853 13f79535-47bb-0310-9956-ffa450edef68
Rename some internal classes from Tls* to Ssl* to better match JRE class names which are SSL* class names.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1596854 13f79535-47bb-0310-9956-ffa450edef68
Camel Case.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1596855 13f79535-47bb-0310-9956-ffa450edef68