BITOP: propagate only when it really SET or DEL targetkey (#5783)
BITOP: propagate only when it really SET or DEL targetkey (#5783)

For example:
    BITOP not targetkey sourcekey

If targetkey and sourcekey doesn't exist, BITOP has no effect,
we do not propagate it, thus can save aof and replica flow.
ctripcorp/redis,charsyam/redis,oranagra/redis,PKRoma/redis,oranagra/redis,ctripcorp/redis,PKRoma/redis,neomantra/redis,yossigo/redis,soloestoy/redis,ctripcorp/redis,charsyam/redis,charsyam/redis,soloestoy/redis,yossigo/redis,yossigo/redis,charsyam/redis,soloestoy/redis,PKRoma/redis,PKRoma/redis,oranagra/redis,oranagra/redis,ofirluzon/redis,yossigo/redis,ctripcorp/redis,neomantra/redis,antirez/redis,ofirluzon/redis,soloestoy/redis,antirez/redis,neomantra/redis,ofirluzon/redis,neomantra/redis,neomantra/redis,antirez/redis,antirez/redis,ofirluzon/redis,charsyam/redis,yossigo/redis,soloestoy/redis,oranagra/redis,ofirluzon/redis,PKRoma/redis