modified concrete appenders to use appropriate constructors

Mutable fields in SocketAppenderBase were previously exposed as
protected fields and modified by constructors in concrete subclasses.
This commit improves encapsulation of the base class by exposing
protected constructors for subclasses to invoke rather than directly
exposing the fields.  These new constructors are marked as deprecated,
as the convenience constructors on the base classes (which are also
deprecated) are the sole reason for their existence.  A future release
should remove all but the no-arg constructor from the base class and
subclasses.

logback-access/src/main/java/ch/qos/logback/access/net/SSLSocketAppender.java

@@ -40,16 +40,15 @@ public SSLSocketAppender() {
    */
   @Deprecated
   public SSLSocketAppender(String host, int port) {
-    this(getAddressByName(host), port);
+    super(host, port);
   }
 
   /**
    * Connects to remote server at <code>address</code> and <code>port</code>.
    */
   @Deprecated
   public SSLSocketAppender(InetAddress address, int port) {
-    this.address = address;
-    this.port = port;
+    super(address.getHostAddress(), port);
   }
 
   @Override

logback-access/src/main/java/ch/qos/logback/access/net/SocketAppender.java

@@ -44,19 +44,15 @@ public SocketAppender() {
    */
   @Deprecated
   public SocketAppender(InetAddress address, int port) {
-    this.address = address;
-    this.remoteHost = address.getHostName();
-    this.port = port;
+    super(address.getHostAddress(), port);
   }
 
   /**
    * Connects to remote server at <code>host</code> and <code>port</code>.
    */
   @Deprecated
   public SocketAppender(String host, int port) {
-    this.port = port;
-    this.address = getAddressByName(host);
-    this.remoteHost = host;
+    super(host, port);
   }
 
   @Override

logback-classic/src/main/java/ch/qos/logback/classic/net/SSLSocketAppender.java

@@ -42,16 +42,15 @@ public SSLSocketAppender() {
    */
   @Deprecated
   public SSLSocketAppender(String host, int port) {
-    this(getAddressByName(host), port);
+    super(host, port);
   }
 
   /**
    * Connects to remote server at <code>address</code> and <code>port</code>.
    */
   @Deprecated
   public SSLSocketAppender(InetAddress address, int port) {
-    this.address = address;
-    this.port = port;
+    super(address.getHostAddress(), port);
   }
 
   @Override

logback-classic/src/main/java/ch/qos/logback/classic/net/SocketAppender.java

@@ -42,23 +42,19 @@ public SocketAppender() {
   }
 
   /**
-   * Connects to remote server at <code>address</code> and <code>port</code>.
+   * Connects to remote server at <code>host</code> and <code>port</code>.
    */
   @Deprecated
-  public SocketAppender(InetAddress address, int port) {
-    this.address = address;
-    this.remoteHost = address.getHostName();
-    this.port = port;
+  public SocketAppender(String host, int port) {
+    super(host, port);
   }
 
   /**
-   * Connects to remote server at <code>host</code> and <code>port</code>.
+   * Connects to remote server at <code>address</code> and <code>port</code>.
    */
   @Deprecated
-  public SocketAppender(String host, int port) {
-    this.port = port;
-    this.address = getAddressByName(host);
-    this.remoteHost = host;
+  public SocketAppender(InetAddress address, int port) {
+    super(address.getHostAddress(), port);
   }
 
   @Override