docs: def acme_init():
      '''
          Init acme key
      '''
      acme_private_key = ACME_PRIVATE_KEY
      acme_intermediate_cert = ACME_INTERMEDIATE_CERT
      acme_intermediate_cert_url = ACME_INTERMEDIATE_CERT_URL
  
      if not os.path.isfile(acme_private_key):
          print 'Create {}'.format(acme_private_key)
          cmd = 'openssl genrsa 4096 > {acme_private_key}'.format(
              acme_private_key=acme_private_key)
          p = subprocess.Popen(cmd,
                               shell=True,
                               stdout=subprocess.PIPE,
                               close_fds=True)
          p.communicate()
          helpers.file_rights(acme_private_key, mode=0444, uid=0, gid=0)
      else:
          print 'Already exist: {}'.format(acme_private_key)
  
      if not os.path.isfile(acme_intermediate_cert):
          print 'Create {}'.format(acme_intermediate_cert)
          cmd = 'wget -O - {acme_intermediate_cert_url} > {acme_intermediate_cert}'
          cmd = cmd.format(acme_intermediate_cert_url=acme_intermediate_cert_url,
                           acme_intermediate_cert=acme_intermediate_cert)
          p = subprocess.Popen(cmd,
                               shell=True,
                               stdout=subprocess.PIPE,
                               close_fds=True)
          p.communicate()
          helpers.file_rights(acme_intermediate_cert, mode=0444, uid=0, gid=0)
      else:
          print 'Already exist: {}'.format(acme_intermediate_cert)