HBASE-23608 Removed redundant groupId from spark module (#61)

Signed-off-by: Balazs Meszaros <meszibalu@apache.org>
diff --git a/spark/pom.xml b/spark/pom.xml
index 917b376..c65670c 100644
--- a/spark/pom.xml
+++ b/spark/pom.xml
@@ -29,7 +29,6 @@
     <relativePath>../</relativePath>
   </parent>
 
-  <groupId>org.apache.hbase.connectors</groupId>
   <artifactId>spark</artifactId>
   <packaging>pom</packaging>
   <version>${revision}</version>