Move cncd/pipeline/pipeline/ to pipeline/ (#347)

* Refactor: move cncd/pipeline/ to pipeline/

* Refactor: move pipeline/pipeline/ to pipeline/

pipeline/error_test.go

@@ -0,0 +1,26 @@
+package pipeline
+
+import (
+	"testing"
+)
+
+func TestExitError(t *testing.T) {
+	err := ExitError{
+		Name: "build",
+		Code: 255,
+	}
+	got, want := err.Error(), "build : exit code 255"
+	if got != want {
+		t.Errorf("Want error message %q, got %q", want, got)
+	}
+}
+
+func TestOomError(t *testing.T) {
+	err := OomError{
+		Name: "build",
+	}
+	got, want := err.Error(), "build : received oom kill"
+	if got != want {
+		t.Errorf("Want error message %q, got %q", want, got)
+	}
+}