See context here: Ia5cc7b34ebee8cf2f49300ce23050370d5f1038a
This user will be useful for containerized undercloud, to maintain
parity with what was done in instack-undercloud.
Depends-On: Ia5cc7b34ebee8cf2f49300ce23050370d5f1038a
Depends-On: Ifd1bec1262dfbd213810bb2b4d561f47bf010e69
Change-Id: I48ab4a0ba0240e931391602943b471b5b6ec8e80