[ASTERIXDB-1564][CONF] Consistently Use Log4j2

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Replace java.util.logging by Log4j2.
- Excluded classes due to their tests:
  - IoUtil
  - Tracer

Change-Id: Ic137571292f45de1f1994c61d328b97185012197
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2226
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Michael Blow <mblow@apache.org>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterixdb/asterix-app/src/main/resources/cc2.conf b/asterixdb/asterix-app/src/main/resources/cc2.conf
index 41beda7..b7e4bc3 100644
--- a/asterixdb/asterix-app/src/main/resources/cc2.conf
+++ b/asterixdb/asterix-app/src/main/resources/cc2.conf
@@ -46,7 +46,7 @@
 heartbeat.period=2000
 
 [common]
-log.level = WARNING
+log.level = WARN
 compiler.framesize=32KB
 compiler.sortmemory=320KB
 compiler.groupmemory=160KB