MINOR: Adding Supervisor StormTimer thread names

[kishorvpatil]

What is the purpose of the change

• StormTimer threads are not names properly on Supervisor.

How was the change tested

Running unit test and jstack shows Thread names

   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.storm.utils.Time.sleep(Time.java:100)
	at org.apache.storm.StormTimer$StormTimerTask.run(StormTimer.java:236)

"WorkerHBTimer" #21 daemon prio=10 os_prio=0 tid=0x00007f92cce62800 nid=0x58a2 waiting on condition [0x00007f92b5ad7000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.storm.utils.Time.sleep(Time.java:100)
	at org.apache.storm.StormTimer$StormTimerTask.run(StormTimer.java:236)

"HBTimer" #20 daemon prio=10 os_prio=0 tid=0x00007f92cce61000 nid=0x58a1 waiting on condition [0x00007f92b5bd8000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.storm.utils.Time.sleep(Time.java:100)
	at org.apache.storm.StormTimer$StormTimerTask.run(StormTimer.java:236)