Add note about overwriting policy.json file
Add note about overwriting policy.json file

Change-Id: I133bd7ed5ac62b9614dece70ceb8016398c138f6
Co-authored-By: Duong Ha-Quang <6be5d0711eff0b1bbe0e25cef7385b108c11e6ac@vn.fujitsu.com>
Closes-Bug: #1722744

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible