IP-1842: Let's encrypt autorenew does not work

Quote from Youtrack

Reporter	mwt (mwt)
Created	Mar 4, 2020 3:33:09 PM
Updated	Mar 4, 2020 3:33:09 PM
Priority	Normal
Type	Bug
State	Submitted
Assignee	Laurent Declercq (nuxwin)
Subsystem	LetsEncrypt plugin
Affected versions	1.5.1
Milestone	1.6.0
Severity	No severity

certificate was not renewed automatically - I found this command to renew manually:
perl /var/www/imscp/gui/plugins/LetsEncrypt/cronjobs/renew.pl -dv

failed with this result:
[Wed Mar 4 16:00:58 2020] [debug] iMSCP::Bootstrapper::boot: Booting backend....
[Wed Mar 4 16:00:58 2020] [debug] iMSCP::LockFile::acquire: Acquiring exclusive lock on /var/lock/imscp.lock
[Wed Mar 4 16:00:58 2020] [debug] iMSCP::Service::_detectInit: Systemd init system has been detected
[Wed Mar 4 16:00:58 2020] [debug] iMSCP::Execute::execute: /bin/systemctl –system is-active mysql.service
[Wed Mar 4 16:00:58 2020] [debug] iMSCP::Provider::Service::Sysvinit::_exec: failed
[Wed Mar 4 16:00:58 2020] [debug] iMSCP::LockFile::release: Releasing exclusive lock on /var/lock/imscp-letsencrypt-renew.lock
[Wed Mar 4 16:00:58 2020] [debug] iMSCP::LockFile::release: Releasing exclusive lock on /var/lock/imscp.lock

LetsEncrypt plugin Version 3.3.0 (Build 2017070300)

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Source: https://youtrack.i-mscp.net/issue/IP-1842