CI: fix kolla-ansible installation after cryptography 3.4 release

Installing kolla-ansible system-wide on CentOS 8 fails with:

    ModuleNotFoundError: No module named 'setuptools_rust'

This error appeared following the release of cryptography 3.4, which now
includes Rust code. It can be installed without Rust using a Python
wheel, but only with more recent pip than version 9.0.3 available as RPM
on CentOS 8. The cryptography bug report [1] recommends pip>=19.1.1.

This change switches to using pip --user when installing kolla-ansible.

Also fixes an issue with ansible-lint which was failing on
etc/kolla/globals.yml due to a missing space before comments.

[1] https://github.com/pyca/cryptography/issues/5753

Change-Id: Ifaf1948ed5d42eebaa62d7bad375bbfc12b134d5
Closes-Bug: #1915141