'Share an already replicated OS image. This operation is only for
publishers. You have to be registered as image publisher with Windows
Azure to be able to call this.
vm_image_name:
The name of the virtual machine image to share
permission:
The sharing permission: public, msdn, or private'

def share_vm_image(self, vm_image_name, permission):

    _validate_not_none('vm_image_name', vm_image_name)
    _validate_not_none('permission', permission)
    path = self._get_sharing_path_using_vm_image_name(vm_image_name)
    query = ('&permission=' + permission)
    path = ((path + '?') + query.lstrip('&'))
    return self._perform_put(path, None, async=True, x_ms_version='2015-04-01')
