fix setting default password

Author: chernser

client-v2/src/main/java/com/clickhouse/client/api/ClientConfigProperties.java

@@ -22,7 +22,7 @@ public enum ClientConfigProperties {
 
     USER("user", "default"),
 
-    PASSWORD("password", ""),
+    PASSWORD("password"),
 
     /**
      * Maximum number of active connection in internal connection pool.

client-v2/src/test/java/com/clickhouse/client/ClientTests.java

@@ -197,7 +197,8 @@ public void testDisableNative() {
 
     @Test(groups = {"integration"})
     public void testDefaultSettings() {
-        try (Client client = new Client.Builder().setUsername("default").addEndpoint("http://localhost:8123").build()) {
+        try (Client client = new Client.Builder().setUsername("default").setPassword("secret")
+                .addEndpoint("http://localhost:8123").build()) {
             Map<String, String> config = client.getConfiguration();
             for (ClientConfigProperties p : ClientConfigProperties.values()) {
                 if (p.getDefaultValue() != null) {
@@ -210,6 +211,7 @@ public void testDefaultSettings() {
 
         try (Client client = new Client.Builder()
                 .setUsername("default")
+                .setPassword("secret")
                 .addEndpoint("http://localhost:8123")
                 .setDefaultDatabase("mydb")
                 .setExecutionTimeout(10, MILLIS)
@@ -268,6 +270,7 @@ public void testDefaultSettings() {
     public void testWithOldDefaults() {
         try (Client client = new Client.Builder()
                 .setUsername("default")
+                .setPassword("seceret")
                 .addEndpoint("http://localhost:8123")
                 .setDefaultDatabase("default")
                 .setExecutionTimeout(0, MILLIS)