improve Config Filter support https

src/main/java/com/alibaba/druid/filter/config/ConfigFilter.java

@@ -169,7 +169,7 @@ public class ConfigFilter extends FilterAdapter {
         InputStream inStream = null;
         try {
             boolean xml = false;
-            if (filePath.startsWith("http://")) {
+            if (filePath.startsWith("http://") || filePath.startsWith("https://")) {
                 URL url = new URL(filePath);
                 inStream = url.openStream();
 

src/test/java/com/alibaba/druid/bvt/filter/config/ConfigLoadFilterTest6.java

@@ -0,0 +1,39 @@
+package com.alibaba.druid.bvt.filter.config;
+
+import java.sql.Connection;
+
+import com.alibaba.druid.mock.MockDriver;
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.util.JdbcUtils;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+public class ConfigLoadFilterTest6 extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("druid-configFile=https://raw.github.com/AlibabaTech/druid/master/src/test/resources/bvt/config/config-0.properties");
+    }
+
+    protected void tearDown() throws Exception {
+        JdbcUtils.close(dataSource);
+    }
+
+    public void test_http_config() throws Exception {
+        Assert.assertEquals(true, dataSource.isTestOnBorrow()); // default
+        Assert.assertEquals(8, dataSource.getMaxActive());
+        
+        dataSource.init();
+
+        Assert.assertEquals(false, dataSource.isTestOnBorrow());
+        Assert.assertEquals(10, dataSource.getMaxActive());
+        Assert.assertEquals("jdbc:mock:config-0", dataSource.getUrl());
+        Assert.assertEquals(MockDriver.instance, dataSource.getDriver());
+
+        Connection conn = dataSource.getConnection();
+        conn.close();
+    }
+}