Update git submodules
* Update releases from branch 'master'
to ca20ca6ad105b9add63dca0165bdaa7a5fb3b85e
- Merge "nova: Release Train 20.6.1"
- nova: Release Train 20.6.1
$ git log --oneline --no-merges 20.6.0..HEAD
618103db9b libvirt: Increase incremental and max sleep time during device detach
9e9c022bde Improve error log when snapshot fails
8559ceeec4 Add config parameter 'live_migration_scheme' to live migration with tls guide
fb81b16df0 compute: Lock by instance.uuid lock during swap_volume
f602536778 replace the "hide_hypervisor_id" to "hw:hide_hypervisor_id"
4350074029 Use subqueryload() instead of joinedload() for (system_)metadata
5c3b4b6c23 Test for disabling greendns
e3bb6119cf Prevent archiving of pci_devices records because of 'instance_uuid'
06b8f1467d libvirt: 'video.vram' property must be an integer
Change-Id: I9ba2df5fa4560c776d49d00c4eb2bbbcf3c0de0b
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