WIP: Support for elytron subsystem

[sabre1041]

Support for elytron subsystem

[sabre1041]

Initial testing with following configuration

{ "elytron" => {
    "key-store" => {
        "newKS" => {
            "type" => "JKS",
            "path" => expression "${jboss.server.config.dir}/jboss.jks",
            "credential-reference" => {"clear-text" => "jboss@123"},
        }
    },
    "key-manager" => {
        "newKM" => {
            "algorithm" => "SunX509",
            "key-store" => "newKS",
            "credential-reference" => {"clear-text" => "jboss@123"},
        }
    },
    "server-ssl-context" => {
        "newSSC" => {
            "key-manager" => "newKM",
            "protocols" => ["TLSv1.2"],
            "cipher-suite-filter" => "TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA",
        }
    }
}
}