Make deployment root directory configurable.

Use the following command to deploy the artifacts to a custom directory
(/tmp/temp):

mvn deploy -DsiteDestination=/tmp/temp

Change-Id: I192381ca565bedef15fac93becc1563eb3ca6b93
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>

pom.xml

@@ -39,7 +39,8 @@
 
   <properties>
     <manifest-location>META-INF</manifest-location>
-    <maven-deploy-destination>file:///home/data/httpd/archive.eclipse.org/tracecompass/tracecompass-test-traces/maven/</maven-deploy-destination>
+    <siteDestination>/home/data/httpd/archive.eclipse.org</siteDestination>
+    <maven-deploy-destination>file:///${siteDestination}/tracecompass/tracecompass-test-traces/maven/</maven-deploy-destination>
   </properties>
 
   <modules>

update-site/pom.xml

@@ -39,7 +39,7 @@
   <packaging>pom</packaging>
 
   <properties>
-    <p2-deploy-destination>/home/data/httpd/archive.eclipse.org/tracecompass/tracecompass-test-traces/repository/latest/</p2-deploy-destination>
+    <p2-deploy-destination>${siteDestination}/tracecompass/tracecompass-test-traces/repository/latest/</p2-deploy-destination>
   </properties>
 
   <pluginRepositories>