Update docs to use upstream components

[surajssd]

Right now the e2e-test document uses a point in time fork, use upstream code instead of these branches.

The fork are used in the following places:

• https://github.com/kinvolk/azure-cvm-tooling/blob/main/docs/end-to-end-test.md#download-kbs-fork
• https://github.com/kinvolk/azure-cvm-tooling/blob/main/docs/end-to-end-test.md#download-the-aa-fork-code