[FIX]Product: Supplier Information is generated randomly on the product form...

[FIX]Product: Supplier Information is generated randomly on the product form so removed sorted funtion used for generate partner list(in _calc_seller function) based on sequence

lp bug: https://launchpad.net/bugs/855464 fixed

bzr revid: ron@tinyerp.com-20110921125933-97wrxxadh41e37cb