Make lots of tests run in parallel

Putting t.Parallel() in each test makes them run in parallel.
Additional t.Parallel() could be added to each subtest, although
that requires making a local copy of the loop variable for
table driven tests.

Test: m checkbuild
Change-Id: I5d9869ead441093f4d7c5757f2447385333a95a4
diff --git a/ui/terminal/status_test.go b/ui/terminal/status_test.go
index aa69dff..da10912 100644
--- a/ui/terminal/status_test.go
+++ b/ui/terminal/status_test.go
@@ -25,6 +25,7 @@
 )
 
 func TestStatusOutput(t *testing.T) {
+	t.Parallel()
 	tests := []struct {
 		name   string
 		calls  func(stat status.StatusOutput)
@@ -266,6 +267,7 @@
 }
 
 func TestSmartStatusOutputWidthChange(t *testing.T) {
+	t.Parallel()
 	os.Setenv(tableHeightEnVar, "")
 
 	smart := &fakeSmartTerminal{termWidth: 40}
diff --git a/ui/terminal/util_test.go b/ui/terminal/util_test.go
index 82bde7c..b01b133 100644
--- a/ui/terminal/util_test.go
+++ b/ui/terminal/util_test.go
@@ -19,6 +19,7 @@
 )
 
 func TestStripAnsiEscapes(t *testing.T) {
+	t.Parallel()
 	testcases := []struct {
 		input  string
 		output string