fix #2883, #2857 pipe fds leak when fork() failed on bg aof rw
fix #2883, #2857 pipe fds leak when fork() failed on bg aof rw

rogerchina/redis,neomantra/redis,spinlock/redis,soloestoy/redis,YongMan/redis,neomantra/redis,ctripcorp/redis,charsyam/redis,ofirluzon/redis,GitHubMota/redis,nnog/redis,rogerchina/redis,Sciumo/redis,ctripcorp/redis,yossigo/redis,spinlock/redis,Sciumo/redis,oranagra/redis,YongMan/redis,PKRoma/redis,oranagra/redis,Sciumo/redis,soveran/redis,antirez/redis,oranagra/redis,hgl888/redis,kensou97/redis,nnog/redis,Sciumo/redis,rogerchina/redis,soloestoy/redis,yossigo/redis,charsyam/redis,nnog/redis,soveran/redis,pmem/redis,PKRoma/redis,charsyam/redis,ofirluzon/redis,ofirluzon/redis,antirez/redis,spinlock/redis,kensou97/redis,hgl888/redis,PKRoma/redis,soloestoy/redis,kensou97/redis,neomantra/redis,YongMan/redis,antirez/redis,PKRoma/redis,neomantra/redis,dreamquster/redis,soveran/redis,charsyam/redis,pmem/redis,antirez/redis,yossigo/redis,dreamquster/redis,soloestoy/redis,GitHubMota/redis,kensou97/redis,charsyam/redis,GitHubMota/redis,rogerchina/redis,yossigo/redis,PKRoma/redis,oranagra/redis,dreamquster/redis,nnog/redis,hgl888/redis,yossigo/redis,soveran/redis,pmem/redis,ofirluzon/redis,spinlock/redis,neomantra/redis,ofirluzon/redis,oranagra/redis,YongMan/redis,soloestoy/redis,GitHubMota/redis,pmem/redis,dreamquster/redis,hgl888/redis,ctripcorp/redis,ctripcorp/redis