modify the properties key of docker configuration for increase readability

skywalking-collector/skywalking-collector-worker/pom.xml

@@ -15,8 +15,8 @@
     <properties>
         <jetty.version>9.4.2.v20170220</jetty.version>
         <main.class>com.a.eye.skywalking.collector.worker.CollectorBootStartUp</main.class>
-        <docker.cache.imageName>skywalking-collector</docker.cache.imageName>
-        <docker.imageTag.version>${version}</docker.imageTag.version>
+        <docker.image.name>skywalking/${artifactId}</docker.image.name>
+        <docker.image.version>${version}</docker.image.version>
     </properties>
 
     <dependencies>
@@ -101,9 +101,9 @@
                 <version>${docker.plugin.version}</version>
                 <configuration>
                     <skipDocker>false</skipDocker>
-                    <imageName>skywalking/${docker.cache.imageName}</imageName>
+                    <imageName>${docker.image.name}</imageName>
                     <imageTags>
-                        <imageTag>${docker.imageTag.version}</imageTag>
+                        <imageTag>${docker.image.version}</imageTag>
                     </imageTags>
                     <dockerDirectory>${project.basedir}/docker</dockerDirectory>
                     <resources>