cpu: fix cpu test on small ARM device where CPU can be at 100%+rounding.

Fixes #99

cpu/cpu_test.go

@@ -82,7 +82,8 @@ func testCPUPercent(t *testing.T, percpu bool) {
 			t.Errorf("error %v", err)
 		}
 		for _, percent := range v {
-			if percent < 0.0 || percent > 100.0*float64(numcpu) {
+			// Check for slightly greater then 100% to account for any rounding issues.
+			if percent < 0.0 || percent > 100.0001*float64(numcpu) {
 				t.Fatalf("CPUPercent value is invalid: %f", percent)
 			}
 		}