Add some protected method for extesion.

[caojie09]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 441

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 65 unchanged lines in 16 files lost coverage.
• Overall coverage increased (+0.02%) to 65.32%

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Files with Coverage Reduction	New Missed Lines	%
infra-sofa-boot-starter/src/main/java/com/alipay/sofa/infra/endpoint/SofaBootVersionEndpoint.java	1	81.94%
healthcheck-sofa-boot-starter/src/main/java/com/alipay/sofa/healthcheck/core/HealthIndicatorCheckProcessor.java	1	70.45%
healthcheck-sofa-boot-starter/src/main/java/com/alipay/sofa/healthcheck/startup/ReadinessCheckProcessor.java	1	75.86%
isle-sofa-boot-starter/src/main/java/com/alipay/sofa/isle/spring/listener/SofaModuleContextRefreshedListener.java	1	72.41%
runtime-sofa-boot-starter/src/main/java/com/alipay/sofa/runtime/service/helper/ReferenceRegisterHelper.java	2	76.19%
runtime-sofa-boot-starter/src/main/java/com/alipay/sofa/runtime/spring/factory/ServiceFactoryBean.java	2	69.44%
test-sofa-boot-starter/src/main/java/com/alipay/sofa/test/runner/SofaJUnit4Runner.java	3	56.67%
infra-sofa-boot-starter/src/main/java/com/alipay/sofa/infra/config/spring/namespace/handler/SofaBootNamespaceHandler.java	3	0.0%
runtime-sofa-boot-starter/src/main/java/com/alipay/sofa/runtime/spring/factory/AbstractContractFactoryBean.java	4	52.38%
healthcheck-sofa-boot-starter/src/main/java/com/alipay/sofa/healthcheck/configuration/HealthCheckConfiguration.java	4	40.0%

Totals
Change from base Build 439:	0.02%
Covered Lines:	1471
Relevant Lines:	2252

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💛 - Coveralls