Upgrade plugins to reproducible build requirements

Author: ppkarwasz

flume-parent/pom.xml

@@ -94,7 +94,7 @@ limitations under the License.
     <mockito.version>1.9.0</mockito.version>
     <mvn-antrun-plugin.version>1.8</mvn-antrun-plugin.version>
     <!-- Do not upgrade the assumbly plugin version until MASSEMBLY-941 is fixed -->
-    <mvn-assembly-plugin.version>3.1.0</mvn-assembly-plugin.version>
+    <mvn-assembly-plugin.version>3.2.0</mvn-assembly-plugin.version>
     <mvn-build-helper-plugin>3.0.0</mvn-build-helper-plugin>
     <mvn-checkstyle-plugin.version>3.1.2</mvn-checkstyle-plugin.version>
     <mvn-checksum-plugin.version>1.7</mvn-checksum-plugin.version>
@@ -103,10 +103,10 @@ limitations under the License.
     <mvn-deploy-plugin.version>2.8.2</mvn-deploy-plugin.version>
     <mvn-gpg-plugin.version>1.6</mvn-gpg-plugin.version>
     <mvn-jar-plugin.version>3.2.2</mvn-jar-plugin.version>
-    <mvn-javadoc-plugin.version>2.9</mvn-javadoc-plugin.version>
+    <mvn-javadoc-plugin.version>3.2.0</mvn-javadoc-plugin.version>
     <mvn-paranamer-plugin.version>2.8</mvn-paranamer-plugin.version>
     <mvn-pmd-plugin.version>3.15.0</mvn-pmd-plugin.version>
-    <mvn-site-plugin.version>3.7.1</mvn-site-plugin.version>
+    <mvn-site-plugin.version>3.9.0</mvn-site-plugin.version>
     <mvn-spotbugs-plugin.version>4.2.0</mvn-spotbugs-plugin.version>
     <mvn-surefire-plugin.version>2.22.2</mvn-surefire-plugin.version>
     <!--<netty.version>3.10.6.Final</netty.version>-->