Ensure that the schema MCFs pass the dc-import linter check

[pradh]

Current state:

    "counters": {
      "Existence_MissingPropertyRef": "11716",
      "Sanity_DcidNameMismatchInSchema": "18",
      "Existence_MissingValueRef_specializationOf": "3",
      "Existence_MissingValueRef_subClassificationOf": "83",
      "Existence_MissingValueRef_location": "2",
      "Existence_MissingValueRef_subPropertyOf": "2",
      "Existence_MissingValueRef_measurementQualifier": "189",
      "Existence_MissingValueRef_emissionsScenario": "9",
      "Existence_MissingPropertyDomainDefinition": "1282",
      "Existence_MissingValueRef_measurementDenominator": "21",
      "Existence_MissingValueRef_race": "713",
      "Existence_MissingValueRef_measuredProperty": "247",
      "Existence_MissingValueRef_naics": "4",
      "Existence_MissingValueRef_internetSubscriptionType": "4",
      "Existence_MissingValueRef_medicalCondition": "2",
      "Existence_MissingValueRef_languageSpokenAtHome": "42",
      "Existence_MissingValueRef_educationalAttainment": "6",
      "Existence_MissingValueRef_workerStatus": "792",
      "Existence_MissingValueRef_populationType": "2",
      "Existence_MissingValueRef_constraintProperties": "20",
      "Existence_MissingValueRef_age": "6"
    }