Check Esxi Hardware Versions Save

This release fixes a bug (issue #68), when no serial number was presented by the CIM elements. The plugin will now show a s/n: None in the output, if no serial number was detected.

This release adds two new parameters --format and --pretty to the plugin. JSON output is now supported. This is required when using the plugin with Zabbix.

Bugfix in TLSv1 usage.

Two minor issues fixed:

• #47
• #48

Details: https://www.claudiokuenzler.com/blog/965/check_esxi_hardware-new-ssl-tls-protocol-parameter