fix bug：std::vector初始化后再emplace导致vector大小翻倍的问题 #674
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cpp17 分支中的muduo/base/tests/BoundedBlockingQueue_test.cc 在运行时会直接core dump，考虑是vector在构造函数指定了大小后，又进行emplace操作，这会使vector大小翻倍，且初始化的内容全为空，后面线程在运行时就会core dump。