Middle East funds negative on Saudi after oil slides
* ** respondent plans to increase overall equity allocations * Oil headed for monthly loss after rallying in April * Saudi Arabia's strict foreign investment rules to limit inflows * Managers moderately positive or neutral on rest of Gulf * Egypt seen positively again after delaying unpopular tax By Olzhas Auyezov DUBAI, May 31 (Reuters) - Middle East fund managers have on balance become bearish on the region's biggest stock market, Saudi Arabia, after oil's rally ran ou