docs: def network_ls(self):
          
          '''
              a method to list the available networks
              
          :return: list of dictionaries with docker network fields
  
          [{
              'NETWORK ID': '3007476acfe5',
              'NAME': 'bridge',
              'DRIVER': 'bridge',
              'SCOPE': 'local'
          }]
          '''
  
          import re
          gap_pattern = re.compile('\t|\s{2,}')
          network_list = []
          sys_command = 'docker network ls'
          output_lines = self.command(sys_command).split('\n')
          column_headers = gap_pattern.split(output_lines[0])
          for i in range(1,len(output_lines)):
              columns = gap_pattern.split(output_lines[i])
              network_details = {}
              if len(columns) > 1:
                  for j in range(len(column_headers)):
                      network_details[column_headers[j]] = ''
                      if j <= len(columns) - 1:
                          network_details[column_headers[j]] = columns[j]
                  network_list.append(network_details)
  
          return network_list