Redis benchmark: fix default hset test key
Redis benchmark: fix default hset test key

neomantra/redis,neomantra/redis,soveran/redis,antirez/redis,yossigo/redis,oranagra/redis,ofirluzon/redis,PKRoma/redis,ctripcorp/redis,soloestoy/redis,neomantra/redis,ofirluzon/redis,oranagra/redis,ofirluzon/redis,charsyam/redis,soveran/redis,PKRoma/redis,soloestoy/redis,antirez/redis,yossigo/redis,ofirluzon/redis,soveran/redis,antirez/redis,pmem/redis,oranagra/redis,soloestoy/redis,pmem/redis,pmem/redis,oranagra/redis,PKRoma/redis,charsyam/redis,oranagra/redis,neomantra/redis,charsyam/redis,ctripcorp/redis,yossigo/redis,charsyam/redis,soveran/redis,ofirluzon/redis,pmem/redis,neomantra/redis,PKRoma/redis,soloestoy/redis,yossigo/redis,PKRoma/redis,ctripcorp/redis,ctripcorp/redis,yossigo/redis,antirez/redis,soloestoy/redis,charsyam/redis