Set 1.2.3 version number
Create release branch.
Set 1.2.2 version number.
Tag version 1.2.2
Merge fix from the trunk.
set 1.2.1 version number.
Create 1.2.1 release branch.
Set 1.2.0 version number.
Create 1.2.0 release branch.
Set 1.1.8 version number.