Possibility to override some yacy.init properties at maven build

It is convenient with Heroky to be able to configure staticIP, http port
and admin initial password at maven build.

defaults/yacy.init

@@ -8,7 +8,7 @@
 
 # ----------------------------------------------------------------------------
 # port number where the server should bind to
-port = 80
+port = 8090
 
 # optinal ssl port (https port) the server should bind to
 port.ssl = 8443

pom.xml

@@ -64,6 +64,64 @@
                 </configuration>
             </plugin>
             
+			<plugin>
+				<artifactId>maven-antrun-plugin</artifactId>
+				<version>1.8</version>
+				<executions>
+					<execution>
+						<id>init.staticIP</id>
+						<phase>prepare-package</phase>
+						<configuration>
+							<target if="yacy.staticIP"
+								description="Set staticIP in yacy.init only if provided as a property">
+								<replaceregexp file="${project.basedir}/defaults/yacy.init"
+               						match="staticIP=(.*)"
+               						replace="staticIP=${yacy.staticIP}"
+               						byline="true"
+								/>
+							</target>
+						</configuration>
+						<goals>
+							<goal>run</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>init.port</id>
+						<phase>prepare-package</phase>
+						<configuration>
+							<target if="yacy.port"
+								description="Set port in yacy.init only if provided as a property">
+								<replaceregexp file="${project.basedir}/defaults/yacy.init"
+               						match="port = (.*)"
+               						replace="port = ${yacy.port}"
+               						byline="true"
+								/>
+							</target>
+						</configuration>
+						<goals>
+							<goal>run</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>init.admin</id>
+						<phase>prepare-package</phase>
+						<configuration>
+							<target if="yacy.admin.passwd"
+								description="Set encoded admin password in yacy.init only if provided as a property">
+								<replaceregexp file="${project.basedir}/defaults/yacy.init"
+               						match="adminAccountBase64MD5=(.*)"
+               						replace="adminAccountBase64MD5=${yacy.admin.passwd}"
+               						byline="true"
+								/>
+							</target>
+						</configuration>
+						<goals>
+							<goal>run</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>