Update git submodules
* Update oslo.cache from branch 'master'
- Merge "Remove the unused coding style modules"
- Remove the unused coding style modules
Python modules related to coding style checks (listed in blacklist.txt in
openstack/requirements repo) are dropped from lower-constraints.txt
as they are not actually used in tests (other than pep8).
more info: https://github.com/openstack/requirements/blob/master/blacklist.txt
Change-Id: I2775a9bdabe76149f97813aa07597bb93abaee94
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