adding getHardwareInfo API to vdsm

Super vdsm retrieves system info about host hardware
parameters. This info will be shown as part of getHardwareInfo
API call in a structure called HardwareInformation.

This feature currently available only for x86 cpu platfroms, for other
platfroms the api call returns empty dictionary.

Feature-Description:
http://wiki.ovirt.org/wiki/Features/Design/HostHardwareInfo

Change-Id: Ic429ef101fcf9047c4b552405314dc7ba9ba07a0
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/9258
Reviewed-by: Barak Azulay <bazulay@redhat.com>
Reviewed-by: Shu Ming <shuming@linux.vnet.ibm.com>
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/11168
Reviewed-by: Dan Kenigsberg <danken@redhat.com>