[HOTFIX] Invalid method signature in GroovyInterpreter

[1ambda]

What is this PR for?

• [ZEPPELIN-2297] improvements to jdbc autocompleter #2203 was merged
• but [ZEPPELIN-2297] improvements to jdbc autocompleter #2203 was not rebased recently
• as a result, GroovyInterperter has invalid method signature.

[ERROR] COMPILATION ERROR : 
[ERROR] /home/travis/build/1ambda/zeppelin/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyInterpreter.java:[123,3] method does not override or implement a method from a supertype
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project zeppelin-groovy: Compilation failure
[ERROR] /home/travis/build/1ambda/zeppelin/groovy/src/main/java/org/apache/zeppelin/groovy/GroovyInterpreter.java:[123,3] method does not override or implement a method from a supertype

You can see CI failures in

• https://travis-ci.org/1ambda/zeppelin/jobs/222709988
• https://travis-ci.org/1ambda/zeppelin/jobs/222709989

What type of PR is it?

[Hot Fix]

Todos

NONE

What is the Jira issue?

Hotfix

How should this be tested?

• CI should be green.
• Build this PR locally, mvn clean package -DskipTests;

Screenshots (if appropriate)

NONE

Questions:

• Does the licenses files need update? - NO
• Is there breaking changes for older versions? - NO
• Does this needs documentation? - NO

[tinkoff-dwh]

LGTM

[AhyoungRyu]

Merge into master as a hotfix