Add listAllVolumes api

Author: jyothisaroja

.travis.yml

@@ -30,3 +30,4 @@ after_success:
 # infrastructure. This should prevent the buffer overflow from
 # https://github.com/travis-ci/travis-ci/issues/5227
 sudo: false
+dist: trusty

core/src/main/java/org/openstack4j/api/storage/BlockVolumeService.java

@@ -56,6 +56,13 @@ public interface BlockVolumeService extends RestService {
 	*/
 	List<? extends Volume> list(Map<String, String> filteringParams);
 
+	/**
+	 * Lists all Block Storage volumes for all tenants.
+	 *
+	 * @return List of all Volumes
+	 */
+	List<? extends Volume> listAll();
+
 	/**
 	 * Gets a Block Storage volume by ID
 	 * @param volumeId the volume identifier

core/src/main/java/org/openstack4j/openstack/storage/block/internal/BlockVolumeServiceImpl.java

@@ -50,6 +50,14 @@ public List<? extends Volume> list(Map<String, String> filteringParams) {
         return volumeInvocation.execute().getList();
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public List<? extends Volume> listAll() {
+        return get(Volumes.class, uri("/volumes/detail")).param("all_tenants", 1).execute().getList();
+    }
+
     /**
      * {@inheritDoc}
      */