Cherry pick bug fixes to v0.15.1

[shizhMSFT]

Bug fixes done in v0.16.0 with orders:

1. fix: logout specified credential config file if provided #626
2. fix: fix the error handling in manifest push #629
3. fix: annotates manifest for attach command #632
4. fix: change to use repo instead of repo.manifest because it needs to fetch a blob #637

[shizhMSFT]

A PR should be created against release-0.15 and merged with rebase merge.

[qweeah]

A PR should be created against release-0.15 and merged with rebase merge.

@shizhMSFT To make releasing process easier, should we add 4 PRs for each cherry-picking?

Also #640 need to be merged in advance.

[shizhMSFT]

To make releasing process easier, should we add 4 PRs for each cherry-picking?

We can have one PR in a shot.

Also #640 need to be merged in advance.

Yes, fix to #640 should be merged before above cherry-pick PR.

[shizhMSFT]

Closed by #643