Description of problem:

With Role based user permission, 'package.admin' user can create a sub package but cannot access to the package. So 'admin' user has to grant the permission for the sub package to the 'package.admin' every time they add a sub package.

This is a feature request to grant permission for sub packages to role 'package.admin'. Because it's more natural for user's workflow.

Steps to Reproduce:
1. Enable Role based user permission
2. Create a package 'com.sample'
3. Add user 'padmin' with role 'package.admin' for 'com.sample'
4. Login as padmin
5. Create a sub package 'com.sample.subpackage'

Actual results:

padmin cannot access 'com.sample.subpackage'

Expected results:

padmin can access 'com.sample.subpackage'