Comment 0 for bug 1526773

While using Ironic we need to ensure that 180 seconds elapsed between updates in Ironic that affect Nova resources status.
Examples:
- Creation of Ironic node and adding it to nova hypervisors list.
- Time between a creation of Ironic node and start of nova instance booting.
- Deletion of nova instance and setting nova hypervisor free from load.
etc.

We need to add this to Release Notes of MOS release with Ironic component.