32a9e2b808
Fixes broken panel registration for source install method due to python 3 changes changing the horizon_lib_dir path dynamically. This sets changes the horizon_dashboard_panel_dir var to utilize the horizon_lib_dir fact being set in in the horizon_install_source.yml playbook. Closes-Bug: 1848561 Depends-On: https://review.opendev.org/689323 Change-Id: Ide5181c14fdc2c67df4df3adaa155d5959b4c468