On system reboot we can not run the ACME renew commands as this currently conflicts with OpenConnect binding on port 80 and thus re-using the port required by `certbot` to check for certificate renewal.
```
Elapsed 0.006 sec:
Executing the "pki certificate vpn.xxx.net acme listen-address x.x.x.x" ...
Elapsed 0.212 sec:
Executing the "pki certificate vpn.xxx.net acme url https://acme-staging-v02.api.letsencrypt.org/directory" ...
Elapsed 0.048 sec:
Elapsed 0.780 sec: _commit_check_cfg_node
Entering the _commit_exec_cfg_node
Executing the "pki" ...
[ pki ]
Updating configuration: "vpn openconnect ssl certificate vpn.xxx.net"
Port 80 is already in use and not available to provide ACME challenge
for "vpn.xxx.net"!
Elapsed 0.027 sec:
Elapsed 0.027 sec: _commit_exec_cfg_node
[[pki]] failed
Entering the _commit_check_cfg_node
Executing the "interfaces loopback lo" ...
Elapsed 0.004 sec:
Elapsed 0.004 sec: _commit_check_cfg_node
Entering the _commit_exec_cfg_node
Executing the "interfaces loopback lo" ...
Elapsed 0.372 sec:
Elapsed 0.372 sec: _commit_exec_cfg_node
```