[et-mgmt-tools] [PATCH 2/2]: Hook up enable/disable stats polling options

[Cole Robinson]

The attached patch hooks up the new preferences options to
enable/disable stats polling.

When polling is disabled, performance graphs in the VM Details->Overview
 tab are labeled as 'Disabled'. The graphs continue to update, but all
the data passed to it is 0:

http://fedorapeople.org/~crobinso/virt-manager/vmm-stats-disabled.png

Also, if the associated stats column is visible in the manager window
when the user disables polling, the manager column disappears. The
View-> entry for that stats type is also disabled, with a tooltip
informing the user that polling is disabled in the preferences dialog.

Thanks,
Cole

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