Support OPA enabled flag from config (#154)

Signed-off-by: Pavol Loffay <p.loffay@gmail.com>

Author: pavolloffay

filter-custom-opa/src/main/java/org/hypertrace/agent/filter/opa/custom/CustomOpaLibProvider.java

@@ -19,7 +19,6 @@
 import com.google.auto.service.AutoService;
 import org.hypertrace.agent.config.Config.AgentConfig;
 import org.hypertrace.agent.config.Config.Reporting;
-import org.hypertrace.agent.core.EnvironmentConfig;
 import org.hypertrace.agent.core.HypertraceConfig;
 import org.hypertrace.agent.filter.FilterRegistry;
 import org.hypertrace.agent.filter.api.Filter;
@@ -29,9 +28,9 @@
 public class CustomOpaLibProvider implements FilterProvider {
 
   public CustomOpaLibProvider() {
-    String property = FilterRegistry.getProviderDisabledPropertyName(CustomOpaLibProvider.class);
     // by default disable this provider until HT agent config includes OPA
-    if (EnvironmentConfig.getProperty(property) == null) {
+    if (!HypertraceConfig.get().getReporting().getOpa().getEnabled().getValue()) {
+      String property = FilterRegistry.getProviderDisabledPropertyName(CustomOpaLibProvider.class);
       System.setProperty(property, "true");
     }
   }