Redis Benchmark: fix key randomization with zero keyspacelen
Redis Benchmark: fix key randomization with zero keyspacelen

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