Improve resilience to random server faults.
Improve resilience to random server faults.

gabrielrussell/mgo,gabrielrussell/mgo,DroiTaipei/mgo,tchajed/mgo,lucasjo/mgo,Danzeer/mgo,henrylee2cn/mgo,henrylee2cn/mgo,go-mgo/travis-test,go-mgo/travis-test,deafgoat/mgo,SocialExplorerFork/mgo,mcuadros/mgo,lucasjo/mgo,raymondjacobson/mgo,dmage/mgo,Yottaa/mgo.v2,SocialExplorerFork/mgo,jjz/mgo,jjz/mgo,deafgoat/mgo,hexadecy/mgo,Yottaa/mgo.v2,DroiTaipei/mgo,tobyzxj/mgo,tmc/mgo,jackspirou/mgo,jjz/mgo,raymondjacobson/mgo,deafgoat/mgo,velocity-toolkit/mgo,mcuadros/mgo,mjs/mgo,Danzeer/mgo,jackspirou/mgo,dmage/mgo,SocialExplorerFork/mgo,tchajed/mgo,hexadecy/mgo,tchajed/mgo,lucasjo/mgo,velocity-toolkit/mgo,Danzeer/mgo,DroiTaipei/mgo,tchajed/mgo,go-mgo/travis-test,lucasjo/mgo,tmc/mgo,Yottaa/mgo.v2,Danzeer/mgo,deafgoat/mgo,jjz/mgo,mcuadros/mgo,gabrielrussell/mgo,SocialExplorerFork/mgo,jackspirou/mgo,Yottaa/mgo.v2,velocity-toolkit/mgo,raymondjacobson/mgo,DroiTaipei/mgo,mjs/mgo,tmc/mgo,mjs/mgo,tobyzxj/mgo,tchajed/mgo,henrylee2cn/mgo,tmc/mgo,jackspirou/mgo,hexadecy/mgo,hexadecy/mgo,mcuadros/mgo,roamz/mgo,dmage/mgo,dmage/mgo,mjs/mgo,raymondjacobson/mgo,tobyzxj/mgo,velocity-toolkit/mgo,henrylee2cn/mgo,gabrielrussell/mgo,tobyzxj/mgo,go-mgo/travis-test