Comment 0 for bug 1656804

Detailed bug description:

method "_validate_hugepages" [0] raises exception errors.InvalidData if some hugepages are allocated.

[0] https://github.com/openstack/fuel-web/blob/master/nailgun/nailgun/api/v1/validators/node.py#L483

this issue affects the following tests

https://product-ci.infra.mirantis.net/job/9.x.system_test.ubuntu.support_hugepages/177/testReport/(root)/check_hugepages_distribution_per_numa/

https://product-ci.infra.mirantis.net/job/9.x.system_test.ubuntu.support_hugepages/177/testReport/(root)/check_instance_one_gb_page_size_mixed_size_host/

https://product-ci.infra.mirantis.net/job/9.x.system_test.ubuntu.support_hugepages/177/testReport/(root)/check_instance_one_gb_page_size_one_gb_host/

https://product-ci.infra.mirantis.net/job/9.x.system_test.ubuntu.support_hugepages/177/testReport/(root)/check_instance_two_mb_page_size_mixed_role_host/

https://product-ci.infra.mirantis.net/job/9.x.system_test.ubuntu.support_hugepages/177/testReport/(root)/check_instance_two_mb_page_size_two_mb_host/