Remove /lib/udev in $PATH for nova-compute
Remove /lib/udev in $PATH for nova-compute

Add /lib/udev environment variable[1] is to solve the scsi_id access
problems, but the patch[2][3] pointed out the absolute path scsi_id,
we can not add /lib/udev environment variables in the system for
nova-compute. So we can remove /lib/udev in $PATH for nova-compute.

[1]https://review.openstack.org/#/c/291285/
[2]https://review.openstack.org/#/c/277224/
[3]https://github.com/openstack/os-brick/blob/master/os_brick/initiator/linuxscsi.py#L147

Change-Id: I5326edf8fff5745ef119c0c3decd6f4c51e8bd5d
Closes-Bug: #1742340

rahulunair/kolla,openstack/kolla,openstack/kolla,stackforge/kolla,stackforge/kolla,stackforge/kolla,rahulunair/kolla