bugfix: fix seata-test module UT not work

[anselleeyy]

• I have searched the issues of this repository and believe that this is not a duplicate.

Ⅰ. Issue Description

seata-test module's UT run failed after server module support springboot-auto-configuration
seata-test 模块的单测用例无法运行，看上去失败原因是由于server模块支持了springboot-auto-configuration

Ⅱ. Describe what happened

If there is an exception, please attach the exception trace:

[SEATA] [Thread-1] INFO  io.seata.config.ConfigurationFactory - load Configuration from :Spring Configuration
Exception in thread "Thread-1" java.lang.ExceptionInInitializerError
	at io.seata.saga.engine.db.AbstractServerTest$1.run(AbstractServerTest.java:55)
	at java.lang.Thread.run(Thread.java:748)
Caused by: io.seata.common.exception.ShouldNeverHappenException: PropertyClass for prefix: [seata.config] should not be null.
	at io.seata.spring.boot.autoconfigure.provider.SpringBootConfigurationProvider.get(SpringBootConfigurationProvider.java:99)
	at io.seata.spring.boot.autoconfigure.provider.SpringBootConfigurationProvider.access$100(SpringBootConfigurationProvider.java:46)
	at io.seata.spring.boot.autoconfigure.provider.SpringBootConfigurationProvider$1.intercept(SpringBootConfigurationProvider.java:59)
	at io.seata.config.FileConfiguration$$EnhancerByCGLIB$$862af1eb.getConfig(<generated>)
	at io.seata.config.ConfigurationFactory.buildConfiguration(ConfigurationFactory.java:102)
	at io.seata.config.ConfigurationFactory.getInstance(ConfigurationFactory.java:94)
	at io.seata.server.ParameterParser.<clinit>(ParameterParser.java:40)
	... 2 more

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

run any test in seata-test module can reproduce it

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• JDK version : 8
• Seata version: latest on develop
• OS : MacOSX
• Others: