Former Samata Party president Jaya Jaitly and two others have been convicted by a court here in a nearly 20-year-old graft case related to a purported defence deal that stemmed from a sensational sting operation by Tehelka news portal.Special CBI judge Virender Bhat held Jaitly, her former party colleague Gopal Pacherwal and Major General S.P. Former Samata Party president Jaya …