Bump oslo.* and pbr version to support >=py38

In zed cycle, OpenStack projects and oslo lib
has dropped the py3.6 and py3.7 support

- https://governance.openstack.org/tc/reference/runtimes/zed.html

I also decrepated oslo-log < 5.0.0, so we should bump oslo.log>=5.0.0.

Because of oslo.log>=5.0.0 depends on oslo.i18n>=3.20.0 as below, so we
also need to upgrade oslo.i18n.

The conflict is caused by:
    The user requested oslo.i18n>=3.15.3
    python-saharaclient 1.4.0 depends on oslo.i18n>=3.15.3
    castellan 0.16.0 depends on oslo.i18n>=3.15.3
    keystonemiddleware 4.17.0 depends on oslo.i18n!=3.15.2 and >=2.1.0
    oslo-config 6.8.0 depends on oslo.i18n>=3.15.3
    oslo-concurrency 3.26.0 depends on oslo.i18n>=3.15.3
    oslo-db 6.0.0 depends on oslo.i18n>=3.15.3
    oslo-log 5.0.0 depends on oslo.i18n>=3.20.0
    The user requested (constraint) oslo-i18n==3.15.3

The conflict is caused by:
    The user requested pbr!=2.1.0 and >=2.0.0
    bashate 0.5.1 depends on pbr>=1.6
    fixtures 3.0.0 depends on pbr>=0.11
    stestr 1.0.0 depends on pbr!=2.1.0 and >=2.0.0
    testresources 2.0.0 depends on pbr>=1.8
    testtools 2.4.0 depends on pbr>=0.11
    python-saharaclient 1.4.0 depends on pbr!=2.1.0 and >=2.0.0
    castellan 0.16.0 depends on pbr!=2.1.0 and >=2.0.0
    keystoneauth1 3.4.0 depends on pbr!=2.1.0 and >=2.0.0
    keystonemiddleware 4.17.0 depends on pbr!=2.1.0 and >=2.0.0
    oslo-concurrency 3.26.0 depends on pbr!=2.1.0 and >=2.0.0
    oslo-context 2.22.0 depends on pbr!=2.1.0 and >=2.0.0
    oslo-db 6.0.0 depends on pbr!=2.1.0 and >=2.0.0
    oslo-i18n 3.20.0 depends on pbr!=2.1.0 and >=2.0.0
    oslo-log 5.0.0 depends on pbr>=3.1.1
    The user requested (constraint) pbr==2.0.0

The conflict is caused by:
    The user requested oslo.serialization!=2.19.1 and >=2.18.0
    python-saharaclient 1.4.0 depends on oslo.serialization!=2.19.1 and >=2.18.0
    keystonemiddleware 4.17.0 depends on oslo.serialization!=2.19.1 and >=1.10.0
    oslo-log 5.0.0 depends on oslo.serialization>=2.25.0
    The user requested (constraint) oslo-serialization==2.18.0

Change-Id: Iebd0c795dcdd72dac1141cfe18d2dad5201147c1

2 files changed, 6 insertions, 6 deletions

diff --git a/requirements.txt b/requirements.txt
index b0bcfcf..dc256aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,13 +2,13 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-pbr!=2.1.0,>=2.0.0 # Apache-2.0
+pbr>=3.1.1 # Apache-2.0
 
 keystoneauth1>=3.4.0 # Apache-2.0
 osc-lib>=2.0.0 # Apache-2.0
-oslo.log>=3.36.0 # Apache-2.0
-oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
-oslo.i18n>=3.15.3 # Apache-2.0
+oslo.log>=5.0.0 # Apache-2.0
+oslo.serialization>=2.25.0 # Apache-2.0
+oslo.i18n>=3.20.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 python-openstackclient>=5.2.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
diff --git a/tox.ini b/tox.ini
index 9be7edc..c1d0ee3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,8 +27,8 @@ passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 basepython = python3
 commands = oslo_debug_helper -t saharaclient/tests/unit {posargs}
 
-[testenv:debug-py36]
-basepython = python3.6
+[testenv:debug-py38]
+basepython = python3.8
 commands = oslo_debug_helper -t saharaclient/tests/unit {posargs}
 
 [testenv:cover]