LOS ANGELES -- A former employee of 13-store independent K.V. Mart Co., Carson, Calif., and another man here have been convicted of solicitation to commit a burglary at the company's offices. The defendants are Gilberto Verdugo Gutierrez, who was terminated as a night-crew manager by K.V. Mart in February 1994, and Thomas Celso Castro -- described by a K.V. Mart attorney as an employee of the United Food and Commercial Workers International Union.