Bump up netty, slf4j, jackson, joda-time maven dependencies

- netty: 4.0.33.Final -> 4.0.36.Final
- jackson: 2.7.0 -> 2.7.3
- joda-time: 2.9 -> 2.9.3
- slf4j -> 1.7.13 -> 1.7.21

Change-Id: If2cdd0e6e0f52d50be232a817cf7d3f27df20ff1
diff --git a/apps/demo/cord-gui/pom.xml b/apps/demo/cord-gui/pom.xml
index 13d02c3..41cbbe5 100644
--- a/apps/demo/cord-gui/pom.xml
+++ b/apps/demo/cord-gui/pom.xml
@@ -57,13 +57,13 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.13</version>
+            <version>1.7.21</version>
         </dependency>
 
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-jdk14</artifactId>
-            <version>1.7.13</version>
+            <version>1.7.21</version>
         </dependency>
 
         <dependency>
@@ -74,12 +74,12 @@
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
-            <version>2.7.0</version>
+            <version>2.7.3</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.7.0</version>
+            <version>2.7.3</version>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>