When deploying with tls enabled in public
endpoints, ansible modules fails due SSL certificates
are self-signed.

This change adds a new variable to allow customization
on which endpoints ansible should connect.
Defaults to admin because admin auth parameters defaults
to admin endpoint.

Change-Id: Ic3ed58cf9c9579cae08a11bbfe6fce983b5a9cbc
Closes-Bug: #1720995

Change-Id: I1577cc3afef4dadd3a188c8ba749c9cdfad313ae

Change-Id: I4653250149dcc3ce46a2ea9622b9228a120764d2
Closes-Bug: #1661595

Usernames can be configured with variables in
configuration files, but user creation is hardcoded.

Change-Id: I057cfb921d776217db66f59226dcfa79f3eb7368
Closes-Bug: #1661587

Co-Authored-By: zhubingbing <zhubingbing10@gmail.com>
Co-Authored-By: zhangshuai <446077695@qq.com>
Co-Authored-By: Mauricio Lima <mauriciolimab@gmail.com>

Change-Id: I7aebe544e3495767d6389dbf220d633a98c137da
Partially-implements: bp karbor-ansible-role