upgrade log4j 2.17.0

Change-Id: I2c7ceb113bae25e02f6fb7e9df02c6193eccd920

Author: zhoney

pom.xml

@@ -96,7 +96,7 @@
         <compiler.target>1.8</compiler.target>
         <slf4j.version>1.7.5</slf4j.version>
         <log4j.version>1.2.17</log4j.version>
-        <log4j2.version>2.15.0</log4j2.version>
+        <log4j2.version>2.17.0</log4j2.version>
         <junit.version>4.12</junit.version>
         <tinkerpop.version>3.4.3</tinkerpop.version>
         <commons.io.version>2.4</commons.io.version>