
### Environment

* Dubbo version: dubbo-2.6.4
* Operating System version: windows 10
* Java version: JDK1.8

When run the testcase(com.alibaba.dubbo.config.AbstractInterfaceConfigTest#checkApplication1) in windows environment,It will be wrong. 

So It should add scene judgement in windows environment(org.apache.dubbo.common.utils.ConfigUtils#loadProperties(java.lang.String, boolean, boolean),Line 220).

```java
if (fileName.startsWith("/")) {
````
change to
```java
if (fileName.startsWith("/")||fileName.matches("^[A-z]:\\\\\\S+$")) {
````
the testcase (com.alibaba.dubbo.config.AbstractInterfaceConfigTest#checkApplication1) will go well.





if (properties != null) {
            getProperties().putAll(properties);
        }
    }
    public static String getProperty(String key) {
        return getProperty(key, null);
    }
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static String getProperty(String key, String defaultValue) {
        String value = System.getProperty(key);
        if (value != null && value.length() > 0) {
            return value;
        }
        Properties properties = getProperties();
        return replaceProperty(properties.getProperty(key, defaultValue), (Map) properties);
    }
    /**
     * System environment -> System properties
     *
     * @param key key
     * @return value
     */
    public static String getSystemProperty(String key) {
        String value = System.getenv(key);
        if (value == null || value.length() == 0) {
            value = System.getProperty(key);
        }
        return value;
    }
    public static Properties loadProperties(String fileName) {