Removed onos.version and use project.version instead

Change-Id: I32aea1a8da457cfd3a413db95d8a528ce91bccf9

@@ -32,7 +32,6 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <onos.version>1.6.0-SNAPSHOT</onos.version>
         <onos.app.name>org.onosproject.dhcprelay</onos.app.name>
         <onos.app.title>DHCP Relay Agent App</onos.app.title>
         <onos.app.origin>ON.Lab</onos.app.origin>
@@ -45,13 +44,13 @@
         <dependency>
             <groupId>org.onosproject</groupId>
             <artifactId>onos-api</artifactId>
-            <version>${onos.version}</version>
+            <version>${project.version}</version>
         </dependency>
 
         <dependency>
             <groupId>org.onosproject</groupId>
             <artifactId>onlab-osgi</artifactId>
-            <version>${onos.version}</version>
+            <version>${project.version}</version>
         </dependency>
 
         <dependency>
@@ -70,7 +69,7 @@
         <dependency>
             <groupId>org.onosproject</groupId>
             <artifactId>onos-api</artifactId>
-            <version>${onos.version}</version>
+            <version>${project.version}</version>
             <scope>test</scope>
             <classifier>tests</classifier>
         </dependency>