Description of problem: Since we have 102 customers on 4.11.3, it would be good to add a direct upgrade path to 4.12.3, so that their upgrade to 4.13 could be less hops.

Version-Release number of selected component (if applicable):
4.12.3

How reproducible:
N/A

Steps to Reproduce:
1. N/A
2.
3.

Actual results:
NA

Expected results:
Upgrade to 4.12.3 directly from 4.11.z

Additional info: