Update dns servers on all iface up events, with ipv6 configurations in some cases we can end up without primary dns server.

Remove duplicate dns library.
Fix searching in history using regexp symbols.

build.xml

@@ -1035,7 +1035,7 @@
             manifest="${src}/net/java/sip/communicator/util/util.manifest.mf">
             <zipfileset dir="${dest}/net/java/sip/communicator/util"
                 prefix="net/java/sip/communicator/util"/>
-            <zipfileset src="${lib.noinst}/dnsjava-2.0.3.jar" prefix=""/>
+            <zipfileset src="${lib.noinst}/dnsjava.jar" prefix=""/>
             <zipfileset src="lib/installer-exclude/laf-widget.jar" prefix=""/>
         </jar>
     </target>

src/net/java/sip/communicator/impl/history/HistoryReaderImpl.java

@@ -7,6 +7,7 @@
 package net.java.sip.communicator.impl.history;
 
 import java.util.*;
+import java.util.regex.*;
 
 import org.w3c.dom.*;
 
@@ -689,7 +690,8 @@ static boolean matchKeyword(String value, String[] keywords,
 
             for (int i = 0; i < keywords.length; i++)
             {
-                if(!value.matches(regexpStart + keywords[i] + REGEXP_END))
+                if(!value.matches(
+                    regexpStart + Pattern.quote(keywords[i]) + REGEXP_END))
                     return false;
             }
 

src/net/java/sip/communicator/util/NetworkUtils.java

@@ -1106,11 +1106,6 @@ private static Lookup createLookup(String domain, int type)
     private static class NetworkListener
         implements NetworkConfigurationChangeListener
     {
-        /**
-         * The last network change we have received.
-         */
-        private int lastChange = -1;
-
         /**
          * Fired when a change has occurred in the
          * computer network configuration.
@@ -1119,13 +1114,10 @@ private static class NetworkListener
          */
         public void configurationChanged(ChangeEvent event)
         {
-            if(lastChange == ChangeEvent.IFACE_DOWN
-                && event.getType() == ChangeEvent.IFACE_UP)
+            if(event.getType() == ChangeEvent.IFACE_UP)
             {
                 reloadDnsResolverConfig();
             }
-
-            lastChange = event.getType();
         }
     }