By Ahmed Rasheed BAGHDAD (Reuters) - Iraqi Prime Minister Haider al-Abadi won the support of his cabinet on Sunday to eliminate a layer of senior government positions, part of a push to reduce corruption and save money in the face of mounting unrest. After weeks of protests demanding better government and a call by leading Shi'ite Muslim cleric Grand Ayatollah Ali al-Sistani for tougher action, Abadi proposed cancelling Iraq's multiple vice president and deputy prime minister positions, currently shared out along sectarian lines. Iraq has three vice presidents, two Shi'ites and a Sunni, and three deputy prime ministers, a Shi'ite, a Sunni and a Kurd.