ONOS-3795 PATCH method in RestSbController and basic unit tests

Change-Id: I35dc31ab03fc72c11523b2c60f4455d7446a5364
diff --git a/protocols/rest/ctl/pom.xml b/protocols/rest/ctl/pom.xml
index bce280e..d417fff 100644
--- a/protocols/rest/ctl/pom.xml
+++ b/protocols/rest/ctl/pom.xml
@@ -48,6 +48,16 @@
             <artifactId>jersey-client</artifactId>
         </dependency>
         <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpclient-osgi</artifactId>
+            <version>4.5.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpcore-osgi</artifactId>
+            <version>4.4.4</version>
+        </dependency>
+        <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
             <version>2.4</version>