[SCB-399] fix incorrect file name of spring bean xml in samples

[zhengyangyong]

Signed-off-by: zhengyangyong yangyong.zheng@huawei.com

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most of them named "pojo.xxx",seems copy & paste and may make confusion

[coveralls]

Coverage increased (+0.006%) to 87.221% when pulling 12213f8 on zhengyangyong:SCB-399 into 2231ed6 on apache:master.