support for redis multi line config

[naughtyGitCat]

for example

client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 512mb 128mb 120
client-output-buffer-limit pubsub 32mb 8mb 60

each line of client-output-buffer-limit means different entry for config

expect

config.GetValue("client-output-buffer-limit")

returns

["normal 0 0 0", "slave 512mb 128mb 120", "pubsub 32mb 8mb 60"]