Update tox.ini for new upper constraints strategy

The requirements team has defined a new strategy for handling
upper constraints[1]. This patch applies those strategies to
Octavia.

[1] http://lists.openstack.org/pipermail/openstack-discuss/ \
    2019-May/006478.html

Change-Id: Idc380dc010e6c8a0e4b1c1ab545f73f457ea7022

doc/requirements.txt

@@ -9,7 +9,8 @@ sphinxcontrib-blockdiag>=1.5.4 # BSD
 sphinxcontrib-nwdiag>=0.9.5 # BSD
 sphinxcontrib-seqdiag>=0.8.4 # BSD
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
 graphviz!=0.5.0,>=0.4 # MIT License
 openstackdocstheme>=1.18.1 # Apache-2.0
 sadisplay>=0.4.8 # BSD
@@ -18,4 +19,5 @@ reno>=2.5.0 # Apache-2.0
 # This needs to be installed after above modules
 pydotplus>=2.0.2 # MIT License
 pyparsing>=2.1.0 # MIT
-networkx>=1.10 # BSD
+networkx>=1.10,<2.3;python_version<'3.0' # BSD
+networkx>=1.10;python_version>='3.4' # BSD

lower-constraints.txt

@@ -83,7 +83,7 @@ oslo.context==2.19.2
 oslo.db==4.27.0
 oslo.i18n==3.15.3
 oslo.log==3.36.0
-oslo.messaging==5.29.0
+oslo.messaging==6.3.0
 oslo.middleware==3.31.0
 oslo.policy==1.30.0
 oslo.reports==1.18.0

requirements.txt

@@ -21,7 +21,7 @@ oslo.context>=2.19.2 # Apache-2.0
 oslo.db>=4.27.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
-oslo.messaging>=5.29.0 # Apache-2.0
+oslo.messaging>=6.3.0 # Apache-2.0
 oslo.middleware>=3.31.0 # Apache-2.0
 oslo.policy>=1.30.0 # Apache-2.0
 oslo.reports>=1.18.0 # Apache-2.0

test-requirements.txt

@@ -18,4 +18,5 @@ doc8>=0.6.0 # Apache-2.0
 bandit>=1.1.0 # Apache-2.0
 tempest>=17.1.0 # Apache-2.0
 # Required for pep8 - doc8 tests
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD

tox.ini

@@ -8,9 +8,10 @@ usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
          PYTHONWARNINGS=default::DeprecationWarning
 install_command =
-    pip install -U -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/rocky} {opts} {packages}
+    pip install {opts} {packages}
 whitelist_externals = find
-deps = -r{toxinidir}/requirements.txt
+deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/rocky}
+       -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
   stestr run '{posargs}'
@@ -21,7 +22,7 @@ basepython = python3
 # This environment is called from CI scripts to test and publish
 # the API Ref to developer.openstack.org.
 deps =
-    -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/rocky}
+    -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/rocky}
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/doc/requirements.txt
 whitelist_externals = rm
@@ -90,7 +91,7 @@ whitelist_externals =
 [testenv:docs]
 basepython = python3
 deps =
-    -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/rocky}
+    -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/rocky}
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/doc/requirements.txt
 whitelist_externals = rm
@@ -160,7 +161,7 @@ max-line-length = 79
 [testenv:releasenotes]
 basepython = python3
 deps =
-    -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/rocky}
+    -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/rocky}
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/doc/requirements.txt
 whitelist_externals = rm