* Moyes leaves Manchester United * Glazer family lose patience with Scot * Van Gaal named as possible replacement (Adds background) By Mike Collett LONDON, April 22 (Reuters) - David Moyes's short and disastrous reign at Old Trafford came to an abrupt end on Tuesday when Manchester United announced he was leaving the club following a hugely disappointing 10-month spell as manager since replacing Alex Ferguson last July. Announcing his departure in a brief statement, shortly after staff arrived for work at the Carrington training ground, United thanked the Scot for "the hard work, honesty and integrity he brought to the role". Ferguson had steered United to the title last season for the 13th time and 20th overall. Moyes's sudden departure evoked memories of the traumatic spell the Old Trafford club suffered between 1969 and 1971 when Matt Busby retired after 24 years as boss. More...