as requested, replace space with _

cdist/conf/explorer/machine_type

@@ -29,23 +29,23 @@ if [ -r /proc/cpuinfo ]; then
         # this file is aviable in xen guest systems
         if [ -r /sys/hypervisor/type ]; then
             if grep -q -i "xen" /sys/hypervisor/type; then
-                echo virtual by xen
+                echo virtual_by_xen
                 exit 
             fi
         else
             if [ -r /sys/class/dmi/id/product_name ]; then
                 if grep -q -i 'vmware' /sys/class/dmi/id/product_name; then
-                    echo "virtual by vmware"
+                    echo "virtual_by_vmware"
                     exit
                 else 
                     if grep -q -i 'bochs' /sys/class/dmi/id/product_name; then
-                        echo "virtual by kvm"
+                        echo "virtual_by_kvm"
                         exit 
                     fi
                 fi
             fi
         fi
-        echo "virtual by unknown"
+        echo "virtual_by_unknown"
     else
         echo "physical"
     fi