RedisNode creation from bare hostname should assign default port

[lukasz-glapinski-exa]

Current code is expecting node information to not contain port but is not assigning default port to portString variable resulting in exception being thrown.

spring-data-redis/src/main/java/org/springframework/data/redis/connection/RedisNode.java

Line 97 in a7d3914

host = hostPortString;

[LeeHyungGeol]

Hi @mp911de. May I handle this issue? I'll create PR within tomorrow.

[LeeHyungGeol]

Fix PR: #3002