--db output now shows selinux status for hosts and also lists which host...

When pysos is run with '--db' we never list which hosts are missing from the log collector. To remedy this I added that as a section to the output, and also added SELinux status to each host that does have an sosreport:

```
	[Hypervisors In All Data Centers]

	NAME	                UUID                	HOST DC NAME	HOST TYPE	RELEASE VER	SPM STATUS	SELINUX
	====	====================================	============	=========	===========	==========	=======	
	HV06	5a4198e4-f989-4738-822f-8976a3c0e131	  MB-iSCSI  	  RHEL   	  unknown  	          	Unknown
	HV07	5be74feb-6101-40cd-a490-86fa7d2ba524	  MB-iSCSI  	  RHEL   	  unknown  	          	Unknown
	HV05	b5798c54-8d84-4cec-a6d5-9d45b5b20f0f	  MB-iSCSI  	  RHEL   	    6.5    	    *     	Enabled


	[Hosts with Missing Sosreports]

	NAME
	====
	hv06
	hv07

```