Remove use of construct lib FieldError exception
Remove use of construct lib FieldError exception

Version 2.8.22 of the construct lib has introduced a change that
removed the core.FieldError exception. The check now uses the
parent exception - core.ConstructError.

Change-Id: I31922c2afc2018a4f6f7ba48094388070537a13f
Closes-Bug: 1745208

openstack/ironic-inspector,openstack/ironic-inspector