Updating to onos:2.2.6-rc1 and using released version of olt and dhcpl2relay apps. Releases voltha-onos:4.1.7

Change-Id: I3ee215bdc123693fbe0fbe957a9b7e4270d05a34
diff --git a/dependencies.xml b/dependencies.xml
index 12d519d..2072792 100644
--- a/dependencies.xml
+++ b/dependencies.xml
@@ -24,14 +24,13 @@
     <version>fake</version>
 
     <properties>
-        <olt.version>4.2.1-SNAPSHOT</olt.version>
+        <olt.version>4.2.1</olt.version>
         <sadis.version>5.1.0</sadis.version>
         <aaa.version>2.1.0</aaa.version>
-        <dhcpl2relay.version>2.2.2-SNAPSHOT</dhcpl2relay.version>
+        <dhcpl2relay.version>2.2.2</dhcpl2relay.version>
         <kafka.version>2.4.0</kafka.version>
         <igmpproxy.version>2.1.2</igmpproxy.version>
         <mcast.version>2.1.0</mcast.version>
-        <maclearner.version>1.0.0</maclearner.version>
     </properties>
 
     <build>
@@ -91,13 +90,6 @@
                             <type>oar</type>
                             <overWrite>true</overWrite>
                         </artifactItem>
-                        <artifactItem>
-                            <groupId>org.opencord</groupId>
-                            <artifactId>maclearner-app</artifactId>
-                            <version>${maclearner.version}</version>
-                            <type>oar</type>
-                            <overWrite>true</overWrite>
-                        </artifactItem>
                     </artifactItems>
                 </configuration>
             </plugin>