[Fix] server env tech name unique constraint

[santostelmo]

Default tech_name field is filled from record name. We have an issue with multi companies. For example, if we tr to set the char of accounts for 2 companies, jornal names and tech_names are populated with the same values in both companies. To avoid that for models defined per company, we change the tech_name unique constraint rule.

[santostelmo]

@simahawk keeping the original code and doing that could be acceptable for you ?

    def _handle_tech_name(self, vals):
        # make sure technical names are always there
        if not vals.get("tech_name") and vals.get("name"):
            name = vals.get("name")
            if self.search_count([('name', '=', name)]) >= 1 and vals.get("company_id"):
                # Name suffix with company ID to avoid duplicated technames in multy company
                name += "-" +  str(vals["company_id"])
            vals["tech_name"] = self._normalize_tech_name(name)

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