Add Linux Container identification

system/setup

@@ -1899,6 +1899,13 @@ class LinuxVirtual(Virtual):
                 self.facts['virtualization_role'] = 'guest'
             return
 
+        if os.path.exists('/proc/1/cgroup'):
+            for line in open('/proc/1/cgroup').readlines():
+                if re.search('/lxc/.*$', line):
+                    self.facts['virtualization_type'] = 'lxc'
+                    self.facts['virtualization_role'] = 'guest'
+                    return
+
         product_name = get_file_content('/sys/devices/virtual/dmi/id/product_name')
 
         if product_name in ['KVM', 'Bochs']: