ACL: WIP: preserve the old config on loading errors.
ACL: WIP: preserve the old config on loading errors.

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