Update gitignore to ignore the cluster-cluster test files (#756)

Normally we can create a test cluster directly in the directory
using `./utils/create-cluster/create-cluster`, which would keep
the test files under `./` and messed up the git.

Signed-off-by: Binbin <binloveplay1314@qq.com>

.gitignore

@@ -5,7 +5,7 @@
 *.so
 *.d
 *.log
-dump.rdb
+dump*.rdb
 *-benchmark
 *-check-aof
 *-check-rdb
@@ -19,7 +19,7 @@ release
 misc/*
 src/release.h
 appendonly.aof*
-appendonlydir
+appendonlydir*
 SHORT_TERM_TODO
 release.h
 src/transfer.sh
@@ -45,5 +45,5 @@ redis.code-workspace
 .cache
 .cscope*
 .swp
-nodes.conf
+nodes*.conf
 tests/cluster/tmp/*