[STORM-1929] Check when create topology

[darionyaphet]

STORM-1929

Add some check when create topology :

1. Spout and Bolt id shouldn't conflict
2. createTopology's spout and bolt set shouldn't empty .

[revans2]

We have topologies that only have spouts (no bolts). I know it is kind of an odd corner case where someone is just reading from an input and writing to an output in one shot, but it is something that we have.

[darionyaphet]

only have spout and don't have bolt is a strange use case . In my mine spout should just read message into topology , any other operation should move into bolts .

I have remove the check of _bolts.size() .