[VOL-4138] updating to ONOS 2.5.2-SNAPSHOT dependencies

Change-Id: I48b7f9a7a551d130a320b18f2cbab4af08ff89e8
diff --git a/pom.xml b/pom.xml
index eb01612..feafe91 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,8 +22,7 @@
     <parent>
         <groupId>org.onosproject</groupId>
         <artifactId>onos-dependencies</artifactId>
-        <version>2.2.7</version>
-        <relativePath></relativePath>
+        <version>2.5.2-SNAPSHOT</version>
     </parent>
 
     <groupId>org.opencord</groupId>
@@ -33,7 +32,6 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <onos.version>2.2.7</onos.version>
         <onos.app.name>org.opencord.olttopology</onos.app.name>
         <onos.app.title>OLT Access Management</onos.app.title>
         <onos.app.origin>OpenCord</onos.app.origin>
@@ -121,7 +119,17 @@
             </snapshots>
         </repository>
     </repositories>
-
+    <pluginRepositories>
+        <pluginRepository>
+            <id>sonatype-snapshots</id>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+            <snapshots>
+                <enabled>true</enabled>
+                <updatePolicy>always</updatePolicy>
+                <checksumPolicy>fail</checksumPolicy>
+            </snapshots>
+        </pluginRepository>
+    </pluginRepositories>
     <build>
         <plugins>
             <plugin>