DATAREDIS-552-Support setting client name for connection with redis server

[jiafu1115]

Motivation:

JedisConnectionFactory should support setting clientName into Jedis so
that we can trouble shooting easier by client name.

now no client name be showed for client list:
id=18 addr=10.140.201.34:51637 fd=12 name= age=85650 idle=85619 flags=N
db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0
events=r cmd=scan

Modifications:

add private member: clientName and use it in constructor for Jedis Pool.

Result:

easier to trouble shooting with connection name:

id=2 addr=10.224.38.23:33652 fd=5 name=sentinel-164682c3-cmd age=1350882
idle=1 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0
omem=0 events=r cmd=ping

[jiafu1115]

@christophstrobl hi, is it reasonable to do create this PR? Thanks!
What's more, can not pass the tracivs-ci build due to followed infos.

testWithMessages(org.springframework.data.redis.config.NamespaceTest) Time elapsed: 0.023 sec <<< ERROR!
org.springframework.data.redis.RedisConnectionFailureException: java.net.SocketException: Connection reset; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketException: Connection reset
at org.springframework.data.redis.config.NamespaceTest.testWithMessages(NamespaceTest.java:56)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketException: Connection reset
at org.springframework.data.redis.config.NamespaceTest.testWithMessages(NamespaceTest.java:56)
Caused by: java.net.SocketException: Connection reset
at org.springframework.data.redis.config.NamespaceTest.testWithMessages(NamespaceTest.java:56)

[christophstrobl]

Generally speaking pull requests are warmly welcome. Adding tests makes them more likely to be accepted.
Please ensure you've read the contribution guidelines and signed the CLA.

The travis-ci build can be a little shaky from time to time.

[jiafu1115]

@christophstrobl. 3ks for your quick reply. I had added function tests and pass all tests. What's more, I create one issue on JIRA:
https://jira.spring.io/browse/DATAREDIS-552

Thanks for your review!

[mp911de]

@jiafu1115 I'll take the PR from here.

[jiafu1115]

@mp911de OK, Thanks, BTW, I know you are the active member for jedis project.

[mp911de]

Thanks for your PR. That's merged.

[jiafu1115]

@mp911de Thanks.