Zeppelin CronJob with release option result in deadlock

There is a deadlock in concurrent cron job execution with release resource option.

Scenario:
Two notebook run with cron job that release resource after job finished.

In Notebook.CronJob.execute() method:
T1. note.runAll(); // locked paragraphs(lock) and wait to interpreterSettings(lock)

T2. notebook.getInterpreterFactory().restart() //locked(interpreterSettings) and wait for paragraphs(lock) during jobAbort.

This will trigger a deadlock that cause zeppelin hang.

Detail stack trace please refer `deadlock_cronjob.jstack`