Fix everything pointed out by @jlee-r7

Author: wchen-r7

modules/auxiliary/scanner/db2/discovery.rb

@@ -46,15 +46,15 @@ def run_host(ip)
         :proto  => 'udp',
         :port   => datastore['RPORT'],
         :type   => 'SERVICE_INFO',
-        :data   => res[2] + "_" + res[1]
+        :data   => "#{res[2]}_#{res[1]}"
         )
 
       report_service(
         :host => ip,
         :port => datastore['RPORT'],
         :proto => 'udp',
         :name => "ibm-db2",
-        :info => res[2] + "_" + res[1]
+        :info => "#{res[2]}_#{res[1]}"
       )
 
       print_status("Host #{ip} node name is " + res[2] + " with a product id of " + res[1] )

modules/auxiliary/scanner/motorola/timbuktu_udp.rb

@@ -52,9 +52,6 @@ def run_host(ip)
         else
           print_error("Unable to determine info for #{ip}...")
         end
-    rescue ::Errno::EPIPE, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Rex::ConnectionRefused => e
-      vprint_error(e.message)
-      elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
     ensure
       disconnect_udp
     end

modules/auxiliary/scanner/sap/sap_router_info_request.rb

@@ -109,7 +109,11 @@ def run_host(ip)
       print_good("#{host_port} - Connected to saprouter")
       print_good("#{host_port} - Sending ROUTER_ADM packet info request")
       sock.put(ni_packet)
-      packet_len = sock.read(4).to_s.unpack('H*')[0].to_i 16
+      sock_res = sock.read(4)
+      unless sock_res
+        fail_with(Failure::Unknown, 'Unable to get the packet length')
+      end
+      packet_len = sock_res.unpack('H*')[0].to_i 16
       print_good("#{host_port} - Got INFO response")
       while packet_len !=0
         count += 1