Leverage upper-constraints files to pin all dependencies

It leverages the latest change from lfdocs-conf and the
upper-constraints.txt now centralized in ONAP docs.
In a long run, upperconstraints.os.txt should be removed once ONAP
is synced with OpenStack.

It removes tox and setuptools from requirements as nothing depends on them
(most requirements should be removed except lfdocsconf)

Issue-ID: DOC-765

Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
Change-Id: I50229191f3a7bc42725f038f9b60eda724d4d4fc
diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index b3188dd..74a3b7a 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,15 +1 @@
-tox
-Sphinx
-doc8
-docutils
-setuptools
-six
-sphinx_rtd_theme>=0.4.3
-sphinxcontrib-blockdiag
-sphinxcontrib-needs>=0.2.3
-sphinxcontrib-nwdiag
-sphinxcontrib-seqdiag
-sphinxcontrib-swaggerdoc
-sphinxcontrib-plantuml
-sphinx_bootstrap_theme
 lfdocs-conf
diff --git a/docs/tox.ini b/docs/tox.ini
index edac8c3..42ffa68 100644
--- a/docs/tox.ini
+++ b/docs/tox.ini
@@ -5,7 +5,10 @@
 
 [testenv:docs]
 basepython = python3
-deps = -r{toxinidir}/requirements-docs.txt
+deps =
+    -r{toxinidir}/requirements-docs.txt
+    -chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt
+    -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt
 commands =
     sphinx-build -b html -n -d {envtmpdir}/doctrees ./ {toxinidir}/_build/html
     echo "Generated docs available in {toxinidir}/_build/html"