Update git submodules
* Update oslo-specs from branch 'master'
- Merge "Add more guidlines about how to contribute on oslo"
- Add more guidlines about how to contribute on oslo
These changes are extracted from oslo's projects contribution guide
`CONTRIBUTING.rst`, it could be more relevant to move them here and in a
second time to remove similar sentences on oslo.*.
Centralize it here will avoid to us to send patch over ~40 projects if
updated are needed on this part in the future.
Change-Id: Ia5cd75427ab72f6fc05308c726b7523bad69c1e6
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