* Kept old specific linter tox targets for backwards compatibility,
so developer can easily run a single linter if desired.
* Reused tox linters virtualenvs to avoid wasting space
* Moved linter config to their official location which enables
developer to call them in any way he wants (like his IDE)
* tools/validate-files.py has been updated to check out all the custom
library files coming from the new validation framework.
Change-Id: I4118200e6862763a0e9dac921dc7c42019224d12
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>
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