Allow requirepass config to clear the password (#7899)
Allow requirepass config to clear the password (#7899)

This is a compatibility issue with redis 5.0 that was introduced by ACL.
Before this commit, setting requirepass to an empty string will result
in a server that needs an empty AUTH, unlike redis 5.0 which would
accept connections without an AUTH.
ofirluzon/redis,PKRoma/redis,oranagra/redis,neomantra/redis,soloestoy/redis,yossigo/redis,oranagra/redis,neomantra/redis,neomantra/redis,antirez/redis,charsyam/redis,antirez/redis,PKRoma/redis,yossigo/redis,ofirluzon/redis,charsyam/redis,soloestoy/redis,yossigo/redis,oranagra/redis,neomantra/redis,charsyam/redis,antirez/redis,PKRoma/redis,ctripcorp/redis,soloestoy/redis,ofirluzon/redis,charsyam/redis,soloestoy/redis,ofirluzon/redis,soloestoy/redis,PKRoma/redis,ofirluzon/redis,ctripcorp/redis,yossigo/redis,antirez/redis,ctripcorp/redis,oranagra/redis,ctripcorp/redis,neomantra/redis,oranagra/redis,PKRoma/redis,charsyam/redis,yossigo/redis