CORDA-759: Enforce key checks on identity de-anonymisation (#1993)

Previously when de-anonymising a Party instance, the name of the Party was used rather than
the key, meaning a Party could be constructed with a random nonsense key and any name, and be treated as corresponding to the well known identity. This is not a security hole in itself as
in any real scenario a party shouldn't be trusted without having been registered, it creates
a significant risk of a security hole depending on how trusted the anonymous identity is, and
the returned identity is considered.

testing/node-driver/src/main/kotlin/net/corda/testing/node/MockServices.kt

@@ -56,6 +56,7 @@ open class MockServices(
         vararg val keys: KeyPair
 ) : ServiceHub, StateLoader by stateLoader {
     companion object {
+        private val MOCK_IDENTITIES = listOf(MEGA_CORP_IDENTITY, MINI_CORP_IDENTITY, DUMMY_CASH_ISSUER_IDENTITY, DUMMY_NOTARY_IDENTITY)
 
         @JvmStatic
         val MOCK_VERSION_INFO = VersionInfo(1, "Mock release", "Mock revision", "Mock Vendor")
@@ -101,7 +102,7 @@ open class MockServices(
         /**
          * Makes database and mock services appropriate for unit tests.
          * @param keys a list of [KeyPair] instances to be used by [MockServices]. Defaults to [MEGA_CORP_KEY]
-         * @param createIdentityService a lambda function returning an instance of [IdentityService]. Defauts to [InMemoryIdentityService].
+         * @param createIdentityService a lambda function returning an instance of [IdentityService]. Defaults to [InMemoryIdentityService].
          *
          * @return a pair where the first element is the instance of [CordaPersistence] and the second is [MockServices].
          */