Cleanup: sentinelGetInstanceTypeString is unused. (#8680)
Cleanup: sentinelGetInstanceTypeString is unused. (#8680)

sentinelGetInstanceTypeString is the same as sentinelRedisInstanceTypeStr,
and not referenced by any functions.
ofirluzon/redis,PKRoma/redis,ofirluzon/redis,PKRoma/redis,ctripcorp/redis,ofirluzon/redis,charsyam/redis,PKRoma/redis,ofirluzon/redis,neomantra/redis,neomantra/redis,oranagra/redis,soloestoy/redis,oranagra/redis,antirez/redis,charsyam/redis,ctripcorp/redis,oranagra/redis,soloestoy/redis,charsyam/redis,neomantra/redis,antirez/redis,neomantra/redis,yossigo/redis,neomantra/redis,PKRoma/redis,soloestoy/redis,soloestoy/redis,soloestoy/redis,antirez/redis,ctripcorp/redis,yossigo/redis,yossigo/redis,yossigo/redis,charsyam/redis,PKRoma/redis,antirez/redis,oranagra/redis,charsyam/redis,ctripcorp/redis,oranagra/redis,yossigo/redis,ofirluzon/redis