Update git submodules
* Update charms.openstack from branch 'master'
- Merge "Add a helpful error message to openstack_upgrade_availble()"
- Add a helpful error message to openstack_upgrade_availble()
After spending time debugging a missing package codename, I felt it
would be useful to add an error message as to why it might be
happening. Hopefully useful in the next round of upgrades.
Change-Id: Ie994f49847b50c1b10e4b76845099cdd09441ecd
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