Since enabling libvirt SASL authentication, the masakari instance
monitor fails to connect to libvirt. We see the following error in logs:

    libvirt.libvirtError: authentication failed: Failed to start SASL
    negotiation: -4 (SASL(-4): no mechanism available: No worthy mechs
    found)

This change adds support for SASL authentication in Masakari instance
monitor.

Depends-On: https://review.opendev.org/c/openstack/kolla/+/834456
Closes-Bug: #1965754
Change-Id: I974046662b383a12ac6281b725523760a96657bd