PR for this BZ https://github.com/ManageIQ/manageiq/pull/18001

FIXED. Verified on 5.10.0.21.20181023151612_4c11b0d.
Request:
POST https://<ip_address>/api/providers
{
	"name": "rhv41",
	"ipaddress": "{{ip_address}}",
	"hostname": "{{hostname}}",
	"connection_configurations": [
		{
			"endpoint": {
				"verify_ssl": 0,
				"role": "default"
                        }
		}
	],
	"credentials": [
		{
			"password": "{{password}}",
			"userid": "{{userid}}"
		}
	],
	"type": "ManageIQ::Providers::Redhat::InfraManager"
}

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:0212