Drop block storage v2 API

This change is to update python-cinderclient to 8.0.0 because cinder
dropped v2 API and doesn't support its client for the API. It also
updates depending packages as below.

* python-cinderclient 8.0.0 depends on pbr>=5.5.0
* python-cinderclient 8.0.0 depends on oslo.utils>=4.8.0
* python-cinderclient 8.0.0 depends on stevedore>=3.3.0
* python-cinderclient 8.0.0 depends on requests>=2.25.1
* python-cinderclient 8.0.0 depends on keystoneauth1>=4.3.1

Signed-off-by: Yasufumi Ogawa <yasufum.o@gmail.com>
Change-Id: Id01fe417acf4da4e5360dfba3bc2cc96df2b6889

lower-constraints.txt

@@ -43,7 +43,7 @@ jmespath==0.9.3
 jsonpatch==1.21
 jsonpointer==2.0
 jsonschema==3.2.0
-keystoneauth1==3.18.0
+keystoneauth1==4.3.1
 keystonemiddleware==4.17.0
 kombu==4.3.0
 kubernetes==11.0.0
@@ -67,7 +67,7 @@ oslo.concurrency==3.26.0
 oslo.config==6.8.0
 oslo.context==2.22.0
 oslo.db==5.0.0
-oslo.i18n==3.20.0
+oslo.i18n==5.0.1
 oslo.log==3.36.0
 oslo.messaging==9.3.0
 oslo.middleware==3.31.0
@@ -77,14 +77,14 @@ oslo.rootwrap==5.8.0
 oslo.serialization==2.18.0
 oslo.service==1.24.0
 oslo.upgradecheck==1.3.0
-oslo.utils==4.5.0
+oslo.utils==4.8.0
 oslo.versionedobjects==1.33.3
 oslotest==3.2.0
 packaging==20.4
 paramiko==2.7.1
 Paste==2.0.2
 PasteDeploy==1.5.0
-pbr==2.0.0
+pbr==5.5.0
 pkg-resources==0.0.0
 prettytable==0.7.2
 psutil==5.4.3
@@ -114,12 +114,12 @@ python-novaclient==9.1.0
 python-subunit==1.0.0
 python-swiftclient==3.5.0
 python-tackerclient==0.8.0
-python-cinderclient==3.3.0
+python-cinderclient==8.0.0
 pytz==2018.3
 PyYAML==5.1
 repoze.lru==0.7
 requests-oauthlib==0.8.0
-requests==2.20.0
+requests==2.25.1
 requests-mock==1.2.0
 requestsexceptions==1.4.0
 restructuredtext-lint==1.1.3
@@ -134,7 +134,7 @@ SQLAlchemy==1.3.11
 sqlparse==0.2.4
 statsd==3.2.2
 stestr==2.0.0
-stevedore==1.20.0
+stevedore==3.3.0
 tempest==22.0.0
 Tempita==0.5.2
 tenacity==4.12.0