CA-220506: Update rbac roles for network.attach_for_vm and network.detach_for_vm API calls.
CA-220506: Update rbac roles for network.attach_for_vm and network.detach_for_vm API calls.

Allow VM_POWER_ADMIN and above roles to perform `network.attach_for_vm` and
`network.detach_for_vm` calls.

Signed-off-by: Sharad Yadav <0ab5d8dd51ae0f2f9ed283cbbbb7a94d110e3347@citrix.com>

jjd27/xen-api,jjd27/xen-api,jjd27/xen-api,jjd27/xen-api,jjd27/xen-api,jjd27/xen-api