Add repository validating interceptor, and update for EMPI->MDM rename

src/main/java/ca/uhn/fhir/jpa/mdm/MdmConfigCondition.java

@@ -0,0 +1,13 @@
+package ca.uhn.fhir.jpa.mdm;
+
+import org.springframework.context.annotation.Condition;
+import org.springframework.context.annotation.ConditionContext;
+import org.springframework.core.type.AnnotatedTypeMetadata;
+
+public class MdmConfigCondition implements Condition {
+  @Override
+  public boolean matches(ConditionContext conditionContext, AnnotatedTypeMetadata metadata) {
+    String property = conditionContext.getEnvironment().getProperty("hapi.fhir.mdm_enabled");
+    return Boolean.parseBoolean(property);
+  }
+}