virtual block devices installed as disk utilization alarms

[BjoernT]

Based off https://github.com/rcbops/rpc-openstack/issues/38, iscsi based devices are still included inside the disk utilization checks/alarms. In this case it was based off pure storage which does not identify as VIRTUAL DISK, unlike the iscsi-initiator

            "sdk": {
                "model": "FlashArray",
                "removable": "0",
                "rev": "415",
                "size": "104857600",
                "state": "running",
                "timeout": "30",
                "vendor": "PURE"
            },

It seems smarter to just look at the udev structure to identify iscsi device like:

 udevadm info --query=all --name=sdk |grep ID_PATH
E: ID_PATH=ip-1.2.3.4:3260-iscsi-iqn.2010-06.com.purestorage:flasharray.789f67b244412741-lun-9