GET /v1/nodes/{node_ident}/management/indicators/{component}
as documented does not work. This calls ironic.api.
controllers.v1.node.IndicatorController.get_one and it will
raise InvalidParameterValue in ironic.api.controllers.v1.node.
IndicatorAtComponent unless `{indicator}@{component}` is given.
Change-Id: I5e7edb36b5f9dacf990215c05a84739d003a09b7