Add HostTime Collector for writing time based mom policies.

It returns host time statistics using python datetime module.
These stats would be useful for creating a time based policy.
Host Collector time interval is controlled in config file.
It provides the following stats -
time_year, time_month, time_day, time_hour,
time_minute, time_second, time_microsecond

Change-Id: I88a9d87d5f7e5a5c5baae2c20518a26a513dcda4
Signed-off-by: Meghal Gosalia <meghal@yahoo-inc.com>
Reviewed-on: http://gerrit.ovirt.org/28613
Reviewed-by: Adam Litke <alitke@redhat.com>
Tested-by: Adam Litke <alitke@redhat.com>