Merge pull request #70 from cisco-system-traffic-generator/guava-uplift

uplift guava to 27.1-jre

Author: leomaatEric

build.gradle

@@ -49,7 +49,7 @@ dependencies {
     compile group: 'org.apache.logging.log4j', name: 'log4j-slf4j-impl', version: '2.11.2'
     compile group: 'org.zeromq', name: 'jeromq', version:'0.5.1'
     compile group: 'com.google.code.gson', name: 'gson', version:'2.8.5'
-    compile group: 'com.google.guava', name: 'guava', version: '24.0-jre'
+    compile group: 'com.google.guava', name: 'guava', version: '27.1-jre'
     compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version:'2.9.8'
     testCompile group: 'junit', name: 'junit', version: '4.12'
     testCompile group: 'org.mockito', name: 'mockito-core', version: '2.28.2'