disable select unit tests on CUDA 3.1 and earlier
disable select unit tests on CUDA 3.1 and earlier

levendlee/thrust,h1arshad/thrust,malenie/thrust,lishi0927/thrust,allendaicool/thrust,h1arshad/thrust,malenie/thrust,julianromera/thrust,bfurtaw/thrust,Vishwa07/thrust,Vishwa07/thrust,google-code-export/thrust,bfurtaw/thrust,google-code-export/thrust,malenie/thrust,UIKit0/thrust,UIKit0/thrust,allendaicool/thrust,google-code-export/thrust,julianromera/thrust,julianromera/thrust,hemmingway/thrust,julianromera/thrust,rdmenezes/thrust,lishi0927/thrust,allendaicool/thrust,UIKit0/thrust,hemmingway/thrust,hemmingway/thrust,levendlee/thrust,levendlee/thrust,allendaicool/thrust,rdmenezes/thrust,rdmenezes/thrust,bfurtaw/thrust,rdmenezes/thrust,Vishwa07/thrust,UIKit0/thrust,h1arshad/thrust,bfurtaw/thrust,levendlee/thrust,lishi0927/thrust,google-code-export/thrust,h1arshad/thrust,malenie/thrust,lishi0927/thrust,hemmingway/thrust,Vishwa07/thrust