cephlab_ansible.sh: use scl rh-python38 on CentOS 7 #738
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cephlab_ansible.sh runs at the very end of the installation process during a cobbler install for fog image capture, on first reboot of the freshly-cobblered system.
Cobbler runs on a CentOS 7 installation today, but its python is too old to support modern ansible. The SCL for python 3.8 is installed on cobbler. Add code here to, if installed, enable the SCL (by setting some paths in the trigger script that is executed on the cobbler server after the installed host reboots; a curl fetch is placed at the end of /etc/rc.local, and this script runs to finish up all the configuration of the host for teuthology use.