'When "massively" (more than one at a time) converting leads to
opportunities, check the salesteam_id and salesmen_ids and update
the values before calling super.'

@api.multi
def _convert_opportunity(self, vals):

    self.ensure_one()
    salesteam_id = (self.team_id.id if self.team_id else False)
    salesmen_ids = []
    if self.user_ids:
        salesmen_ids = self.user_ids.ids
    vals.update({'user_ids': salesmen_ids, 'team_id': salesteam_id})
    return super(Lead2OpportunityMassConvert, self)._convert_opportunity(vals)
