Added plugin 102 VM Logging

This plugin checks to see if the log.keepold and log.rotatesize settings
are configured on your virtual machines.
Updated 73 to allow for VMs stored on multiple datastores

Previously if a VM was stored on multiple datastores the plugin would
error out due to not being able to compare MemoryMB to a string
(FreeSpaceMB was returned as "AAAA BBBBB", A being the size for one
datastore B the size of the other). The plugin now finds the datastore
the VMX file is stored on and compares the memory to that.
Merge pull request #68 from CoteRL/master

Created plugin 102 VM Logging, Updated plugin 73