TBR: Revert "TBR skip flaky tests, see http://v.io/i/682"

This reverts commit dd22c186f505dbc366f2f462b49406f9dbae4e78.

Trying out a fix by setting GOMAXPROCS to 1.

Change-Id: Ice225b005520644472c046579ec1b293f9396746
diff --git a/lib/exec/exec_test.go b/lib/exec/exec_test.go
index 33aa710..6426f8c 100644
--- a/lib/exec/exec_test.go
+++ b/lib/exec/exec_test.go
@@ -379,7 +379,6 @@
 }
 
 func TestToCompletion(t *testing.T) {
-	t.Skip("failing on Go1.5, see http://v.io/i/682")
 	ph := readyHelper(t, "TestToCompletion", "testSuccess", "...ok")
 	e := ph.Wait(time.Second)
 	if e != nil {
@@ -398,7 +397,6 @@
 }
 
 func TestExtraFiles(t *testing.T) {
-	t.Skip("failing on Go1.5, see http://v.io/i/682")
 	cmd := helperCommand("testExtraFiles")
 	rd, wr, err := os.Pipe()
 	if err != nil {