fix global sharing schemaCache into exclusive schemaGraph

Author: Pengzna

hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/cache/CachedSchemaTransactionV2.java

@@ -87,7 +87,7 @@ public void close() {
     private Cache<Id, Object> cache(String prefix, long capacity) {
         // TODO: uncomment later - graph space
         //final String name = prefix + "-" + this.graph().spaceGraphName();
-        final String name = prefix + "-" + "";
+        final String name = prefix + "-" + this.graphName();
         // NOTE: must disable schema cache-expire due to getAllSchema()
         return CacheManager.instance().cache(name, capacity);
     }

hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/MultiGraphsTest.java

@@ -211,8 +211,8 @@ public void testCopySchemaWithMultiGraphsWithConflict() {
         g1.serverStarted(GlobalMasterInfo.master("server-g1c"));
         g2.serverStarted(GlobalMasterInfo.master("server-g2c"));
 
-        g1.schema().propertyKey("id").asInt().create();
-        g2.schema().propertyKey("id").asText().create();
+        g1.schema().propertyKey("id").asInt().checkExist(false).create();
+        g2.schema().propertyKey("id").asText().checkExist(false).create();
 
         Assert.assertThrows(ExistedException.class, () -> {
             g2.schema().copyFrom(g1.schema());