[COMMON] Add doc linting

Add 3 automated doc linting (sphinx building, linkchecking and doc8) in
order to have an error free documentations
Fix also issues found by these linters in order to start without errors.

Issue-ID: OOM-2648
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I318718c956020412a120ba3caeb9e21d35a99833
(cherry picked from commit ec07bca720e5e2156be085e89f1ce8521a602eaf)
7 files changed