In case anyone needs it:
$ juju run -a octavia 'sudo sed -i s/"enabled_provider_drivers = .*"/"enabled_provider_drivers = amphora:The Octavia Amphora driver"/g /etc/octavia/octavia.conf; sudo systemctl restart octavia-*; sudo systemctl status octavia-*'
In case anyone needs it:
$ juju run -a octavia 'sudo sed -i s/"enabled_ provider_ drivers = .*"/"enabled_ provider_ drivers = amphora:The Octavia Amphora driver"/g /etc/octavia/ octavia. conf; sudo systemctl restart octavia-*; sudo systemctl status octavia-*'