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.
22 Checking VM Hardware Version - FIlter VMs

I've added a filter, similar to the one used in the datastore
information plugin, that will exclude vms from this report. In my case
it is mainly used for DSVAs and vShield appliances which will remain on
HWversion 7.

Have tested on my vCenter reports and it seems to be working fine.
Merge pull request #73 from craiggumbley/master

Updated Checking VM Hardware Version with exclusion filter