the option is not effective anyway as there are other frontend validations

This seems to be a RFE (but lacks correct keywords), on the wrong component?

no, that's just a removal of annoying/useless config option in rhvm-setup-plugins blocking the actual RFE for HP VM live migration

This BZ solution was changed to totally removing the "CpuPinMigrationEnabled" config value from vdc_options table for upstream & downstream. 
This config value is not needed anymore due to supporting bug 1457250.

Verified on:
ovirt-engine-4.2.6.4-0.0.master.20180823141941.gitb3a5b18.el7.noarch
ovirt-engine-setup-base-4.2.6.4-0.0.master.20180823141941.gitb3a5b18.el7.noarch
ovirt-engine-setup-plugin-ovirt-engine-4.2.6.4-0.0.master.20180823141941.gitb3a5b18.el7.noarch
ovirt-engine-setup-plugin-ovirt-engine-common-4.2.6.4-0.0.master.20180823141941.gitb3a5b18.el7.noarch


Steps:
1. Connect to the engine via SSH
2. Run:
# su - postgres
# psql -d engine
engine=# select * from vdc_options where option_name = 'CpuPinMigrationEnabled';

Results:
 option_id | option_name | option_value | version 
-----------+-------------+--------------+---------
(0 rows)

QE verification bot: the bug was verified upstream