[OOM] mutualize sphinx linting

docs and docs-linkcheck are both using sphinx
and can run easily in parallel without interfering.
Both jobs take less than 3 minutes.
This is often less than the allocation time of a jenkins minion.
All of this make the mutualization of these 2 jobs wishable.

- use one subproject for docs and docs-linkcheck tox profile.
- enable tox parallel mode

Issue-ID: OOM-2648
Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>
Change-Id: I2f61fa489ca7ab543a667d07009bf32929329456
diff --git a/jjb/oom/oom-main-linter.yaml b/jjb/oom/oom-main-linter.yaml
index a3bc20e..6a4dc7a 100644
--- a/jjb/oom/oom-main-linter.yaml
+++ b/jjb/oom/oom-main-linter.yaml
@@ -14,14 +14,11 @@
           tox-dir: "."
           tox-envs: "doc8"
           pattern: "docs/**"
-      - "linkcheck":
-          tox-dir: "."
-          tox-envs: "docs-linkcheck"
-          pattern: "docs/**"
       - "sphinx":
           tox-dir: "."
-          tox-envs: "docs"
+          tox-envs: "docs,docs-linkcheck"
           pattern: "docs/**"
+          parallel: true
     stream:
       - "master":
           branch: "master"