Update git submodules
* Update magnum from branch 'master'
- Merge "Fix small issues rolling upgrade"
- Fix small issues rolling upgrade
There are several some issues in current upgrade script.
1. The kubectl command location has changed
2. Before checking the digest of the hyperkube image, better wait
until the image fully downloaded.
3. Using full name to inspect image
4. Get the correct ostree commit id
Task: 39785
Story: 2007676
Change-Id: I5c16b123683ef1173c22d4e4628c36234871cb93
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