Fix stack trace/error handling in AIX snmp version

Author: HD Moore

modules/auxiliary/scanner/snmp/aix_version.rb

@@ -69,12 +69,12 @@ def run_host(ip)
 
 				print_status(status)
 			end
-
 			disconnect_snmp
-
+		rescue SNMP::RequestTimeout, Rex::ConnectionError, ::Errno::ECONNREFUSED
 		rescue Exception => e
-			print_error("#{e.class}, #{e.message}")
-
+			print_error("#{ip} #{e.class}, #{e.message}")
+		ensure
+			disconnect_snmp
 		end
 
 	end