Pin SQLAlchemy to <2.0.0

Rally code is not compatible with SQLAlchemy-2.0.0,
until it's compatible let's pin it.

CI jobs are broken with multiple errors, so to get
this in also need following fixes:-
- Remove python-dev from bindep to fix announce-release
  and docs jobs
- Update upper-constraints for testtools to 2.5.0 to fix
  issues with python3.10+
- Update tox.ini for tox4 compatibility
- Ignore warnings introdueced with oslo.db-12.1.0,
  SQLAlchemy-1.4.46
- Make tox-cover job non-voting as to get it passing
  coverage report need to succeed for previous commit,
  which will not succeed without the required changes
  in this patch. It will be made voting again in follow
  up patch.

Related-Bug: #2004022
Change-Id: Ifcffd11e300e1485fdbfa54b23bcdcaa6ad61011

.zuul.d/zuul.yaml

@@ -6,7 +6,8 @@
       rtd_webhook_id: "52691"
     check:
       jobs:
-        - rally-tox-cover
+        - rally-tox-cover:
+            voting: false
         - rally-tox-docs
         - rally-tox-pep8
         - rally-tox-py36
@@ -24,7 +25,7 @@
         - rally-docker-build
     gate:
       jobs:
-        - rally-tox-cover
+        #- rally-tox-cover
         - rally-tox-docs
         - rally-tox-pep8
         - rally-tox-py36

bindep.txt

@@ -13,7 +13,6 @@ libxml2-devel [platform:rpm]
 libxslt1-dev [platform:dpkg]
 libxslt-devel [platform:rpm]
 openssl-devel [platform:rpm]
-python-dev [platform:dpkg]
 python3-devel [platform:rpm]
 redhat-rpm-config [platform:rpm !platform:suse]
 iputils-ping [platform:dpkg]

requirements.txt

@@ -19,5 +19,5 @@ pyOpenSSL                                              # Apache License, Version
 PyYAML                                                 # MIT
 python-subunit                                         # Apache-2.0 or BSD
 requests!=2.20.0,!=2.24.0                              # Apache License, Version 2.0
-SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8              # MIT
+SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,<2.0.0       # MIT
 virtualenv!=16.3.0                                     # MIT

tox.ini

@@ -1,6 +1,5 @@
 [tox]
 minversion = 3.2.0
-skipsdist = True
 ignore_basepython_conflict = true
 envlist = py36,py37,py38,pep8,samples
 
@@ -13,7 +12,7 @@ setenv = VIRTUAL_ENV={envdir}
          LC_ALL=C
          PYTHONHASHSEED=0
          TOX_ENV_NAME={envname}
-whitelist_externals = find
+allowlist_externals = find
                       rm
                       make
 deps = -r{toxinidir}/requirements.txt
@@ -25,7 +24,14 @@ commands =
   python {toxinidir}/tests/ci/pytest_launcher.py tests/unit --posargs={posargs}
 distribute = false
 basepython = python3.6
-passenv = PYTEST_REPORT http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
+passenv =
+          PYTEST_REPORT
+          http_proxy
+          HTTP_PROXY
+          https_proxy
+          HTTPS_PROXY
+          no_proxy
+          NO_PROXY
 
 [testenv:pep8]
 commands = flake8
@@ -71,6 +77,7 @@ commands =
 
 [testenv:cover]
 commands = {toxinidir}/tests/ci/cover.sh {posargs}
+allowlist_externals = {toxinidir}/tests/ci/cover.sh
 
 [testenv:docs]
 # min py3.6
@@ -152,6 +159,10 @@ commands = \
 filterwarnings =
     error
     ignore:.*EngineFacade is deprecated; please use oslo_db.sqlalchemy.enginefacade*:
+    # Introduced with oslo.db-12.1.0
+    ignore:.*Support for the MySQL NDB Cluster storage engine has been deprecated and will be removed in a future release.:DeprecationWarning:
+    # Introuduced with SQLAlchemy-1.4.46, can be removed when rally supports SQLAlchemy>=2.0.0
+    ignore:.*Set environment variable SQLALCHEMY_SILENCE_UBER_WARNING=1 to silence this message.*
     # instead of ignoring all modules, let's list only libraries that are failing
     ignore:invalid escape sequence:DeprecationWarning:.*netaddr.*
     ignore:invalid escape sequence:DeprecationWarning:.*prettytable
@@ -166,3 +177,5 @@ filterwarnings =
     ignore:Using or importing the ABCs:DeprecationWarning:unittest2.*
     # python 3.8
     ignore:::.*netaddr.strategy.*
+    # pytest-cov
+    ignore:The --rsyncdir command line argument and rsyncdirs config variable are deprecated.:DeprecationWarning:

upper-constraints.txt

@@ -60,7 +60,7 @@ stevedore===3.3.0
 Tempita===0.5.2
 testresources===2.0.1
 testscenarios===0.5.0
-testtools===2.4.0
+testtools===2.5.0
 traceback2===1.4.0
 typing-extensions===3.10.0.0
 unittest2===1.1.0