Adding Clusters to the db output

Clusters and their information are now added to the '--db' output, as well as inclusion for 3.3 and 3.4 version numbers

```
	[Clusters In All Data Centers]

	    NAME     	                UUID                	COMPAT VER	        CPU TYPE        	DC UUID
	=============	====================================	==========	========================	=======	
	   Default   	99408929-82cf-4dc7-a532-9d998063fa95	   3.3    	Intel SandyBridge Family	   2   
	MB-2014-Hosts	42a10afa-d5d2-4d39-9a67-c081af3b40a4	   3.4    	Intel SandyBridge Family	   1   

```