Improve Tenant Deletion via Tenant deletion Admin Service.

[Thumimku]

Description: This Issue is regarding improvement of Tenant Deletion. Please go through document below and you can find

• Existing method description
• Bugs in Existing Method
• Existing methods capability in Tenant Deletion

Tenant Deletion Document

Shortly existing flow can only remove tenant from JDBC Primary User Store, Registry tables and some caches. But while deleting we need to consider about other than mentioned above

• Tokens
• All Caches and cache managers
• Service Providers
• Deployment Folders
• Java layer Registries

** Related Issues ** Security exception occurred when try to create a tenant with deleted tenant's domain name