Upgrade to Apache Karaf 4.2.8 to support Kafka log appender

This is required for CORD. Karaf 4.2.6 explicitelly prevents loading of
some of the bundles required to support shipping logs via Karaf.

Change-Id: I8ae525e6c8a04c0381c5e3bac39de1a7b85b4446
diff --git a/deps/deps.json b/deps/deps.json
index 157ef3c..a8f0a20 100644
--- a/deps/deps.json
+++ b/deps/deps.json
@@ -251,13 +251,13 @@
     "org.osgi.service.metatype.annotations": "mvn:org.osgi:org.osgi.service.metatype.annotations:1.4.0",
     "org.osgi.service.cm": "mvn:org.osgi:org.osgi.service.cm:1.6.0",
     "org.apache.felix.scr.bnd": "mvn:org.apache.felix:org.apache.felix.scr.bnd:1.9.0",
-    "org.apache.karaf.features.core": "mvn:org.apache.karaf.features:org.apache.karaf.features.core:4.2.6",
-    "org.apache.karaf.shell.console": "mvn:org.apache.karaf.shell:org.apache.karaf.shell.console:4.2.6",
-    "org.apache.karaf.shell.core": "mvn:org.apache.karaf.shell:org.apache.karaf.shell.core:4.2.6",
+    "org.apache.karaf.features.core": "mvn:org.apache.karaf.features:org.apache.karaf.features.core:4.2.8",
+    "org.apache.karaf.shell.console": "mvn:org.apache.karaf.shell:org.apache.karaf.shell.console:4.2.8",
+    "org.apache.karaf.shell.core": "mvn:org.apache.karaf.shell:org.apache.karaf.shell.core:4.2.8",
     "org.apache.httpcomponents.httpasyncclient-osgi": "mvn:org.apache.httpcomponents:httpasyncclient-osgi:4.1.2",
     "org.apache.httpcomponents.httpcore-nio": "mvn:org.apache.httpcomponents:httpcore-nio:4.4.4",
-    "org.apache.karaf.jaas": "mvn:org.apache.karaf.jaas:org.apache.karaf.jaas.modules:4.2.6",
-    "org.apache.karaf.system.core": "mvn:org.apache.karaf.system:org.apache.karaf.system.core:4.2.6",
+    "org.apache.karaf.jaas": "mvn:org.apache.karaf.jaas:org.apache.karaf.jaas.modules:4.2.8",
+    "org.apache.karaf.system.core": "mvn:org.apache.karaf.system:org.apache.karaf.system.core:4.2.8",
     "org.apache.servicemix.bundles.snmp4j": "mvn:org.apache.servicemix.bundles:org.apache.servicemix.bundles.snmp4j:2.3.4_1",
     "org.osgi.cmpn": "mvn:org.osgi:osgi.cmpn:6.0.0",
     "osgi-core": "mvn:org.osgi:org.osgi.core:6.0.0",
@@ -273,7 +273,7 @@
     "typesafe-config": "mvn:com.typesafe:config:1.3.2",
     "validation-api": "mvn:javax.validation:validation-api:2.0.1.Final",
     "checkstyle": "mvn:com.puppycrawl.tools:checkstyle:8.10",
-    "apache-karaf": "https://repo1.maven.org/maven2/org/onosproject/apache-karaf-offline/4.2.6-offline-20190628/apache-karaf-4.2.6-offline-20190628.tar.gz",
+    "apache-karaf": "https://repo.maven.apache.org/maven2/org/onosproject/apache-karaf-offline/4.2.8-offline-20200131/apache-karaf-4.2.8-offline-20200131.tar.gz",
     "bndlib": "mvn:biz.aQute.bnd:biz.aQute.bndlib:jar:4.1.0",
     "bndexe": "mvn:biz.aQute.bnd:biz.aQute.bnd:4.1.0",
     "libthrift": "mvn:org.apache.thrift:libthrift:0.11.0",