Hi,I pull a request for add_server to upstream,and include testing code#12

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chunshengster wants to merge 5 commits intoopenresty:masterfrom

chunshengster:master

Commits on Mar 10, 2015

add add_server function and nginx.conf ,but not full test,and the respawn worker has no add data
王春生
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add add_server function and nginx.conf ,but not full test,and the respawn worker has no add data
王春生
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Commits on Mar 16, 2015

debug uscf->servers->pool ,修正 add_server 函数中，server错误的内存地址，基本完成功能
王春生
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添加测试用例
chunshengster@gmail.com
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Commits on Mar 17, 2015

add test configuration file
王春生
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