* Remove useless dependencies and add jsp-2.1-6.1.14
* Determine if principal is empty in getJdbcUrl method
* fix bug when register worker but create master node in zookeeper
* Remove useless dependencies such as hive-shims and log4j
* upgrade commons-email from 1.2 to 1.5 and remove mail-1.4.5.jar
* add support for postgresql in upgrade database
* add support for postgresql in upgrade database
* mission log disorder，bug #751 fix
* the log path of the task and the log path of the task instance are different. The log cannot be viewed. #723
* the log path of the task and the log path of the task instance are different. The log cannot be viewed. #723 bug fix
* after starting kerberos authentication, tgt expires after one day，bug #742 fix
* log pattern modify
* LoggerServer remove comment code and ShellCommandExecutor modify
* PythonCommandExecutor modify
* Concurrent task log bug #730 fix
* remove invalid commit
* make the edit button of the properties file clickable
* bug fixed - Service Management only shows one device status
* bug fixed, the master server cannot be validated at startup because parameters 'masterZNode' are not initialized
* Remove useless dependencies and add jsp-2.1-6.1.14
* Determine if principal is empty in getJdbcUrl method
* fix bug when register worker but create master node in zookeeper
* Remove useless dependencies such as hive-shims and log4j
* Remove useless dependencies and add jsp-2.1-6.1.14
* Determine if principal is empty in getJdbcUrl method
* fix bug when register worker but create master node in zookeeper
* add druid connection provider in order to change quartz default connection pool
* remove c3p0 in escheduler-api and escheduler-dao
* change method name queryByIdAndIp to queryBySessionId and queryByUserIdAndIp to queryByUserId
* change connectionProvider.class from c3p0 to druid
* change connectionProvider.class from c3p0 to druid
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