Check to see if the modules for this state instance need to be updated,
        only update if the state is a file or a package and if it changed
        something. If the file function is managed check to see if the file is a
        possible module type, e.g. a python, pyx, or .so. Always refresh if the
        function is recurse, since that can lay down anything.

def check_refresh(self, data, ret):
        '''
        Check to see if the modules for this state instance need to be updated,
        only update if the state is a file or a package and if it changed
        something. If the file function is managed check to see if the file is a
        possible module type, e.g. a python, pyx, or .so. Always refresh if the
        function is recurse, since that can lay down anything.
        '''
        _reload_modules = False
        if data.get('reload_grains', False):
            log.debug('Refreshing grains...')
            self.opts['grains'] = salt.loader.grains(self.opts)
            _reload_modules = True

        if data.get('reload_pillar', False):
            log.debug('Refreshing pillar...')
            self.opts['pillar'] = self._gather_pillar()
            _reload_modules = True

        if not ret['changes']:
            if data.get('force_reload_modules', False):
                self.module_refresh()
            return

        if data.get('reload_modules', False) or _reload_modules:
            # User explicitly requests a reload
            self.module_refresh()
            return

        if data['state'] == 'file':
            if data['fun'] == 'managed':
                if data['name'].endswith(
                    ('.py', '.pyx', '.pyo', '.pyc', '.so')):
                    self.module_refresh()
            elif data['fun'] == 'recurse':
                self.module_refresh()
            elif data['fun'] == 'symlink':
                if 'bin' in data['name']:
                    self.module_refresh()
        elif data['state'] in ('pkg', 'ports'):
            self.module_refresh()