optimize namespace more operation button UI

add delta schema to upgrade db from v0.4.0 to v0.5.0

close/open namespace content

delete namespace

enlarge sleep interval for ut

[0.5.0] version to 0.5.0

fix coverity defect

add constraint on bizconfig

User can add admins when create application

Optimize client parse performance

Clean release message on demand and do async notification if there are too many clients to notify

append page context info to url

check namespace and branch exist when update gray rules

check namespace and branch exist when update gray rules

optimize ConfigService.getConfig performance

ignore GET request for open api audit

fix modal can not scroll bug