By Asif Shahzad and Ariba Shahid ISLAMABAD (Reuters) -A Pakistani anti-graft court jailed former Prime Minister Imran Khan and his wife Bushra Khan for 14 years each on charges of illegally selling state gifts, his party and lawyers said on Wednesday, just over a week before a national election. The verdict, which marked the third conviction handed down to the embattled ex-cricket star in the last few months, also included a 10-year disqualification from holding public office, his party, the Pakistan Tehreek-e-Insaf (PTI), said. Bushra Khan, commonly known as Bushra Bibi, gave herself up for a…