DATAJPA-1542 - Add wagon maven plugin.

Re add maven wagon plugin required for documentation upload.

pom.xml

@@ -566,6 +566,10 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-assembly-plugin</artifactId>
 			</plugin>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>wagon-maven-plugin</artifactId>
+			</plugin>
 			<plugin>
 				<groupId>org.asciidoctor</groupId>
 				<artifactId>asciidoctor-maven-plugin</artifactId>