Alert checks against storage_perc fail when using WMI

When enabling WMI checking for windows hosts the "storage" poller module is automatically disabled by observium poller for individual devices that support WMI when they next get polled.

This is because WMI is now fetching the disk stats?

We have alert triggers that watch "storage_perc gt 90" and on devices that have WMI enabled they never scan/check/populate. If we manually enable "storage" poller module in that device they will scan, but this module is auto-disabled again on next poll.

The disk graphs all seem to be populating ok, and the application support enabled by WMI is nice so we would rather not revert back to SNMP only based monitoring.