Create plugin to monitor for disconnected/inaccessible datastores

[atc0005]

Probably better to have the plugin report any inaccessible datastores, not just a specific one as per the existing check_vmware_datastore plugin.

Allow for excluding datastores based on name, maybe based on prefix.

[atc0005]

Looks like there is an accessible boolean property under the DatastoreSummary data object type. There is also a maintenanceMode property (string type, currently value normal for a functional datastore), which should probably be taken into consideration when considering whether an accessible property value of false should be acted upon.

[atc0005]

Probably better to have the plugin report any inaccessible datastores, not just a specific one as per the existing check_vmware_datastore plugin.

Probably want to make sure the plugin name implies monitoring groups of datastores.

As already stated, the option to include or exclude based on name is a good direction. Additional features:

• matching based on prefix
• matching based on regex
• matching based on folder

Some of this support can leverage existing functionality, other features will require expanding bundled library code.