feature #1678: Monitor free space in VMware datastores
feature #1678: Add total capacity check on VMware datastores
feature #1678: typo returning ds values
Merge branch 'master' into feature-1678
feature #1678: monitor system ds probe for kvm and xen
feature #1678: bug in install.sh
feature-1678: take out the first parameter in collectd-client_control.sh

A new parameter was added in clinet_control. This moved the parameters
one possition and breaks monitor_ds probe. Now the parameter
is substituted.
feature #1678: add monitor_ds.sh
Feature #1678: DS inserts clone & ln target attributes into each disk
(cherry picked from commit 4487c7cc62ecc14d1f6853858e17e52b6e21541c)
Feature #1678: Method to calculate VM storage usage in scheduler
Feature #1678: Filters VMs that do not fit in the image DS
Feature #1678: Make all disk related variables long long
Feature #1678: Host monitorization copies DS info to each system DS. Assumes all DS are shared.
Feature #1678: CLI does not hide system DS capacity
Feature #1678: Bug in Host::update_info
Feature #1678: Bug in DatastoreXML::add_capacity
Feature #1678: Scheduler does not use storage requirements to test host capacity
Feature #1678: error msg format
Add SIGQUIT and SIGTERM handlers to collectd driver. Exit when cannot read from oned pipes

(cherry picked from commit 41b38d3bda083fa50f4d78d7e5baf15278f012f0)
feature #1678: Datastore location sent to the IM driver. Updated probes and collector manager accordingly