Before:
  call ale#assert#SetUpLinterTest('verilog', 'iverilog')

After:
  call ale#assert#TearDownLinterTest()

Execute(The default iverilog command should be correct):
  AssertLinter 'iverilog', 'iverilog -t null -Wall  %t'

Execute(iverilog options should be configurable):
  " Additional args for the linter
  let g:ale_verilog_iverilog_options = '-y.'

  AssertLinter 'iverilog', 'iverilog -t null -Wall -y. %t'