Fix Precommit Job

It looks like the precommit job is performing an additional "git clone" that overwrites the PR

Author: Enrico Olivelli <eolivelli@apache.org>

Reviewers: andor@apache.prg

Closes #1460 from eolivelli/fix/pr-job-fix

Jenkinsfile-PreCommit

@@ -36,7 +36,6 @@ pipeline {
     stages {
         stage('BuildAndTest') {
             steps {
-                git 'https://github.com/apache/zookeeper'
                 sh "git clean -fxd"
                 sh "mvn verify spotbugs:check checkstyle:check -Pfull-build -Dsurefire-forkcount=4"
             }