OPENDJ-808 Implement a simple commons REST based HTTP connection handler

Added the HTTPConnnectionHandler implemented using Grizzly.
Added support for all configuration similar to the LDAPConnectionHandler.
Missing support for ds-cfg-keep-stats and ds-cfg-num-request-handlers.


config.ldif, 02-config.ldif:
Added new entry for HTTP connection handler + defaults.

HTTPConnectionHandlerCfgDefn.properties, HTTPConnectionHandlerConfiguration.xml: ADDED

LDAPConnectionHandlerConfiguration.xml:
Moved properties common to HTTPConnectionHandlerConfiguration.xml to Package.xml .

protocol*.properties:
Merged protocol messages between LDAP, HTTP and JMX. Made them non LDAP specific.
Added 2 new protocol messages for HTTP.


CollectClientConnectionsFilter.java, HTTPClientConnection.java, HTTPConnectionHandler.java, package-info.java: ADDED

JmxClientConnection.java, JmxConnectionHandler.java, LDAPClientConnection.java:
Used common protocol messages.

LDAPConnectionHandler.java
Used common protocol messages.
Extracted method configureSSL()
Simplified the code in getEnabledSSLCipherSuites() and getEnabledSSLProtocols() and protected against a multi threaded change ofg the SSL engine by using a local copy.