Merge branch 'upgrade-log4j2' into 'master'

Upgrade log4j2 from v2.6.2 to v2.14.1

See merge request funnelback-rnd/funnelback-shared!143

Author: Luke Butters

plugin-archetypes/src/main/resources/archetype-resources/pom.xml

@@ -7,7 +7,7 @@
     <version>${version}</version>
     <name>Funnelback plugin</name>
     <properties>
-        <version.log4j2>2.6.2</version.log4j2>
+        <version.log4j2>2.14.1</version.log4j2>
         <version.junit>4.12</version.junit>
         <version.mockito>2.21.0</version.mockito>
         <version.funnelback-shared>${archetypeVersion}</version.funnelback-shared>