Werk #6355: Fix possible activation warning message about /etc/ssl/certs/localhost.crt certificate

During configuration activation the "trusted certificates file" var/ssl/ca-certificates.crt is computed based on the configured global settings. In case the system certificates are trusted all certificates in /etc/ssl/certs are read.

We found several RH/CentOS distros to have a /etc/ssl/certs/localhost.crt which seems to be some kind of default certificate for local servers. The files may have a permission of 600 which makes it not readable for the site user.

This results in an activation warning like this: ca-certificates: Failed to add certificate '/etc/ssl/certs/localhost.crt' to trusted CA certificates. See web.log for details and these entries in the var/log/web.log:

2018-06-21 03:55:52,120 [40] [cmk.web 19066] /master/check_mk/wato.py Internal error: Traceback (most recent call last): File "/omd/sites/master/share/check_mk/web/htdocs/watolib.py", line 501, in _get_system_wide_trusted_ca_certificates trusted_cas.update(self._get_certificates_from_file(os.path.join(cert_path, entry))) File "/omd/sites/master/share/check_mk/web/htdocs/watolib.py", line 514, in _get_certificates_from_file return [ match.group(0) for match in self._PEM_RE.finditer(open(path).read()) ] IOError: [Errno 13] Permission denied: '/etc/ssl/certs/localhost.crt'

Because this may be a standard configuration and affect a lot of users we decided to remove this warning for the /etc/ssl/certs/localhost.crt.

In case you need this /etc/ssl/certs/localhost.crt to be added to the trusted CA certificates simply chown it to 644. It is a public certificate and not a secret.

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