Bump Rest catalog to 21

Author: ayushtkn

kudu-handler/src/test/org/apache/hadoop/hive/kudu/TestKuduSerDe.java

@@ -33,7 +33,6 @@
 
 import org.junit.After;
 import org.junit.Before;
-import org.junit.Rule;
 import org.junit.Test;
 
 import com.google.common.collect.ImmutableList;

standalone-metastore/metastore-rest-catalog/pom.xml

@@ -21,8 +21,6 @@
   <name>Hive Metastore REST Catalog</name>
   <properties>
     <standalone.metastore.path.to.root>..</standalone.metastore.path.to.root>
-    <maven.compiler.source>8</maven.compiler.source>
-    <maven.compiler.target>8</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <log4j2.debug>false</log4j2.debug>
     <hive.version>${project.parent.version}</hive.version>