* refactor app namespace duplicate message

* fix non-properties namespace display issue

* add cluster open api client
* add toString for open api dtos
* add rollback release open api

java client's long polling timeout is 90 seconds, so server side long polling timeout must be less than 90 (#2630)

fix the issue that project owner cannot manage application master even if role.manage-app-master.enabled is turned off (#2627)

openapi support create and load cluster info

* configure server side's long polling timeout

* logical update

* Revert "logical update"

This reverts commit 99943df3

* logic uapte

Add system property role.create-application.enabled to control whether anyone can create application or not.

Add system property role.manage-app-master.enabled to control whether any app master can add/delete other app master