Add ability to set custom keystone user names

Add ability to set custom keystone user names in keystoneng
module if they are present in pillar.

Depends-On: https://gerrit.mcp.mirantis.com/#/c/44319/
Depends-On: https://gerrit.mcp.mirantis.com/#/c/44320/
Depends-On: https://gerrit.mcp.mirantis.com/#/c/45119/

Change-Id: I4c528a231529d7466afa5d7c80f3135ecaa00239
Related-Prod: PROD-31315
(cherry picked from commit 196016fcaeb572108221933051b67568a52e80b7)
3 files changed