updated copright dates in several documentation files

COPYING

-Copyright (C) 2009-2018 Internet Systems Consortium, Inc. ("ISC")
+Copyright (C) 2009-2019 Internet Systems Consortium, Inc. ("ISC")
 
 This Source Code Form is subject to the terms of the Mozilla Public
 License, v. 2.0. If a copy of the MPL was not distributed with this

src/bin/admin/kea-admin.xml

@@ -34,7 +34,7 @@
 
   <docinfo>
     <copyright>
-      <year>2014-2018</year>
+      <year>2014-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/agent/kea-ctrl-agent.xml

@@ -36,7 +36,7 @@
 
   <docinfo>
     <copyright>
-      <year>2016-2018</year>
+      <year>2016-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/d2/kea-dhcp-ddns.xml

@@ -35,7 +35,7 @@
 
   <docinfo>
     <copyright>
-      <year>2013-2018</year>
+      <year>2013-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/dhcp4/kea-dhcp4.xml

@@ -35,7 +35,7 @@
 
   <docinfo>
     <copyright>
-      <year>2011-2018</year>
+      <year>2011-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/dhcp6/kea-dhcp6.xml

@@ -34,7 +34,7 @@
 
   <docinfo>
     <copyright>
-      <year>2011-2018</year>
+      <year>2011-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/keactrl/keactrl.xml

@@ -35,7 +35,7 @@
 
   <docinfo>
     <copyright>
-      <year>2014-2018</year>
+      <year>2014-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/lfc/kea-lfc.xml

@@ -35,7 +35,7 @@
 
   <docinfo>
     <copyright>
-      <year>2015-2018</year>
+      <year>2015-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/perfdhcp/perfdhcp.xml

@@ -36,7 +36,7 @@
 
     <docinfo>
         <copyright>
-            <year>2016-2018</year>
+            <year>2016-2019</year>
             <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
         </copyright>
     </docinfo>

src/bin/shell/kea-shell.xml

@@ -35,7 +35,7 @@
 
   <docinfo>
     <copyright>
-      <year>2017-2018</year>
+      <year>2017-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

src/bin/sockcreator/kea-sockcreator.xml

@@ -41,7 +41,7 @@
 
   <docinfo>
     <copyright>
-      <year>2014-2018</year>
+      <year>2014-2019</year>
       <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
     </copyright>
   </docinfo>

tools/system_messages.cc

@@ -94,7 +94,7 @@ const std::string FILE_HEADER =
     <title>Kea Messages Manual</title>\n\
 \n\
     <copyright>\n\
-      <year>2011-2018</year>\n\
+      <year>2011-2019</year>\n\
       <holder>Internet Systems Consortium, Inc. (\"ISC\")</holder>\n\
     </copyright>\n\
 \n\