* move version to parent pom

* move version properties to parent pom for easy management

* remove freemarker dependency

* delete CombinedApplicationServer

* #1871 correct spelling

* #1873 some updates for TaskQueueZkImpl

* #1875 remove unused properties in pom

* #1878
1. remove tomcat dependency
2. remove combined_logback.xml in api module
3. format pom.xml for not aligning

* #1885 fix api server startup failure
1. add jsp-2.1 dependency
2. remove jasper-runtime dependency

* add stringutils ut (#1921)

* add stringutils ut

* Newfeature for #1675. (#1908)

Continue to finish the rest works, add the cache feature for dependence,mr,python,sub_process,procedure and shell.

* Add modify user name for process definition (#1919)

* class overrides equals() and should therefore also override hashCode()

* #1862 add modify user in process difinition list

* #1862 add pg-1.2.2 ddl.sql

* modify ScriptRunnerTest

* add updateProessDifinition UT

* modify updateProcessDifinition UT

* modify updateProcessDifinition UT

* modify mysql 1.2.2 ddl.sql&dml.sql

* add scope test to mysql in pom

* modify pg-1.2.2 ddl.sql

* refactor module

* updates
Co-authored-by: Nkhadgarmage <khadgar.mage@outlook.com>
Co-authored-by: Nzhukai <boness@qq.com>
Co-authored-by: NYelli <amarantine@my.com>

* 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