Fix possible failure during startup when depends on rpc starter alone in project.

[QilongZhang]

java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

	at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:161)
	at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:225)
	at org.springframework.context.support.AbstractRefreshableApplicationContext.<init>(AbstractRefreshableApplicationContext.java:88)
	at org.springframework.context.support.AbstractRefreshableConfigApplicationContext.<init>(AbstractRefreshableConfigApplicationContext.java:58)
	at org.springframework.context.support.AbstractXmlApplicationContext.<init>(AbstractXmlApplicationContext.java:61)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:136)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
	at com.alipay.test.embeded.sofa.EmbeddedContextInitializerTest.init(EmbeddedContextInitializerTest.java:43)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)

As the dependency of commons-logging is removed at PR #97 . Actually, we should add jcl-over-slf4j.