Reorganizing pom.xml

- consolidate versions
- enable error-prone
- fix issue detected by error-prone

Change-Id: Ie2f5d53b7357ec43dd00e56097f7163ca1a63094
diff --git a/runtime/pom.xml b/runtime/pom.xml
index be493dd..03ccdd1 100644
--- a/runtime/pom.xml
+++ b/runtime/pom.xml
@@ -37,7 +37,6 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.21</version>
         </dependency>
         <dependency>
             <groupId>org.onosproject</groupId>
@@ -52,12 +51,6 @@
         <dependency>
             <groupId>org.osgi</groupId>
             <artifactId>org.osgi.core</artifactId>
-            <version>5.0.0</version>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>RELEASE</version>
         </dependency>
     </dependencies>
 
@@ -113,18 +106,17 @@
                         </goals>
                         <configuration>
                             <target>
-                                <delete includeemptydirs="true">
+                                <delete includeemptydirs="true" failonerror="false">
                                     <fileset
                                             dir="${project.build.outputDirectory}/org/onosproject/yang/gen"
                                             includes="**/*"/>
                                 </delete>
-                                <delete includeemptydirs="true">
+                                <delete includeemptydirs="true" failonerror="false">
                                     <fileset
                                             dir="${project.build.outputDirectory}/yang"
                                             includes="**/*"/>
                                 </delete>
-                                <delete includeemptydirs="true"
-                                        failonerror="false">
+                                <delete includeemptydirs="true" failonerror="false">
                                     <fileset
                                             dir="${project.build.outputDirectory}/Temp"
                                             includes="**/*"/>