Memory leak ps_dist-inl.h

[TangXing]

==39376== 13,413 (8 direct, 13,405 indirect) bytes in 1 blocks are definitely lost in loss record 491 of 495 ==39376== at 0x4A05FD5: operator new(unsigned long) (vg_replace_malloc.c:324) ==39376== by 0x4C24F3: MShadowServerNode (ps_dist-inl.h:111) ==39376== by 0x4C24F3: CreateServerNode(int, char**) (nnet_ps_server.cpp:168) ==39376== by 0x4F8308: ps::App::Create(int, char**) (ps_main.cc:7) ==39376== by 0x5059DA: ps::Manager::Init(int, char**) (manager.cc:29) ==39376== by 0x508B15: ps::Postoffice::Run(int*, char***) (postoffice.cc:20) ==39376== by 0x4F8E44: StartSystem (ps.h:16) ==39376== by 0x4F8E44: main (ps_main.cc:14)