verify lower bound of cdap version

Author: mrahanjam

pom.xml

@@ -27,14 +27,14 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <cdap.version>6.7.0-SNAPSHOT</cdap.version>
+    <cdap.version>6.8.0-SNAPSHOT</cdap.version>
     <hadoop.version>2.3.0</hadoop.version>
     <hsql.version>2.2.4</hsql.version>
     <hydrator.version>2.9.0-SNAPSHOT</hydrator.version>
     <!-- properties for script build step that creates the config files for the artifacts -->
     <widgets.dir>widgets</widgets.dir>
     <docs.dir>docs</docs.dir>
-    <app.parents>system:cdap-data-pipeline[6.1.1,7.0.0-SNAPSHOT)</app.parents>
+    <app.parents>system:cdap-data-pipeline[6.8.0-SNAPSHOT,7.0.0-SNAPSHOT)</app.parents>
     <!-- this is here because project.basedir evaluates to null in the script build step -->
     <main.basedir>${project.basedir}</main.basedir>
     <commons.codec.version>1.6</commons.codec.version>
@@ -308,8 +308,8 @@
         <version>1.1.0</version>
         <configuration>
           <cdapArtifacts>
-            <parent>system:cdap-data-pipeline[6.1.1,7.0.0-SNAPSHOT)</parent>
-            <parent>system:cdap-data-streams[6.1.1,7.0.0-SNAPSHOT)</parent>
+            <parent>system:cdap-data-pipeline[6.8.0-SNAPSHOT,7.0.0-SNAPSHOT)</parent>
+            <parent>system:cdap-data-streams[6.8.0-SNAPSHOT,7.0.0-SNAPSHOT)</parent>
           </cdapArtifacts>
         </configuration>
         <executions>