addressed review suggestions

Author: mneethiraj

authz-embedded/src/main/java/org/apache/ranger/authz/embedded/RangerEmbeddedAuthorizer.java

@@ -36,8 +36,8 @@
 import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
 import java.util.Properties;
 import java.util.Set;
@@ -134,7 +134,7 @@ public RangerMultiAuthzResult authorize(RangerMultiAuthzRequest request, RangerA
     }
 
     public Set<String> getLoadedServices() {
-        return Collections.unmodifiableSet(this.plugins.keySet());
+        return new HashSet<>(this.plugins.keySet());
     }
 
     @Override

dev-support/ranger-docker/Dockerfile.ranger-pdp

@@ -27,9 +27,9 @@ COPY ./scripts/pdp/ranger-pdp.sh             ${RANGER_SCRIPTS}/
 RUN    tar xvfz /home/ranger/dist/ranger-${PDP_VERSION}-pdp.tar.gz --directory=${RANGER_HOME} \
     && ln -s ${RANGER_HOME}/ranger-${PDP_VERSION}-pdp ${RANGER_HOME}/pdp \
     && rm -f /home/ranger/dist/ranger-${PDP_VERSION}-pdp.tar.gz \
-    && mkdir -p /var/log/ranger/pdp /etc/ranger/cache \
+    && mkdir -p /var/log/ranger/pdp /var/run/ranger /etc/ranger/cache \
     && ln -s ${RANGER_HOME}/pdp/ranger-pdp-services.sh /usr/bin/ranger-pdp-services.sh \
-    && chown -R ranger:ranger ${RANGER_HOME}/pdp/ ${RANGER_SCRIPTS}/ /var/log/ranger/ /etc/ranger/ \
+    && chown -R ranger:ranger ${RANGER_HOME}/pdp/ ${RANGER_SCRIPTS}/ /var/log/ranger/ /var/run/ranger /etc/ranger/ \
     && chmod 744 ${RANGER_SCRIPTS}/ranger-pdp.sh
 
 USER ranger