Upgrading from RHEL6 to RHEL7 fails with "FIPS integrity test failed" error

Issue

• On FIPS enabled installations, after upgrading from RHEL6 to RHEL7 using the redhat-upgrade-tool utility, the system fails to boot, printing the following messages on the console:

  ...
  [  OK  ] Reached target Initrd File Systems.
  [  OK  ] Reached target Initrd Default Target.
           Starting dracut pre-pivot and cleanup hook...
  [   45.091997] dracut: FATAL: FIPS integrity test failed
  [   44.609452] dracut-pre-pivot[626]: Warning: /boot/.vmlinuz-3.10.0-514.el7.x86_64.hmac does not exist
  [   45.095147] dracut: Refusing to continue
  ...