Optional monitoring properties for KVM hypervisor

In the AIM properties file in the [stats] section to manage statistics for metrics and monitoring:

1. collectFreqSeconds = 60

2. refreshFreqSeconds = 30

3. database = /var/lib/abiquo-aim.db 

See the AIM agent for further details.

To support metric dimensions in KVM through AIM, in Abiquo properties, set abiquo.vsm.measures.pusher.frequency. 
See vsm properties in https://abiquo.atlassian.net/wiki/spaces/doc/pages/311375440