[goal] Migrate testing to ubuntu focal

As per victoria cycle testing runtime and community goal[1]
we need to migrate upstream CI/CD to Ubuntu Focal(20.04).

Fixing:
- Bump the lower constraints for required deps which added python3.8 support
in their later version.

Story: #2007865
Task: #40207

[1] https://governance.openstack.org/tc/goals/selected/victoria/migrate-ci-cd-jobs-to-ubuntu-focal.h>

Change-Id: I978482f860a766c474944c77e2c569541f4849b1

lower-constraints.txt

@@ -2,7 +2,7 @@ alembic==0.9.6
 appdirs==1.3.0
 Babel==2.3.4
 bandit==1.4.0
-cffi==1.7.0
+cffi==1.14.0
 cliff==2.8.0
 cmd2==0.8.0
 coverage==4.0
@@ -14,12 +14,12 @@ fixtures==3.0.0
 future==0.16.0
 gitdb==0.6.4
 GitPython==1.0.1
-greenlet==0.4.10
+greenlet==0.4.15
 iso8601==0.1.11
 keystoneauth1==3.4.0
 linecache2==1.0.0
 Mako==0.4.0
-MarkupSafe==1.0
+MarkupSafe==1.1.1
 monotonic==0.6
 netaddr==0.7.18
 netifaces==0.10.4
@@ -32,7 +32,7 @@ oslotest==3.2.0
 pbr==2.0.0
 pifpaf==0.10.0
 prettytable==0.7.2
-psycopg2==2.7.0
+psycopg2==2.8.0
 pycparser==2.18
 PyMySQL==0.7.6
 pyparsing==2.1.0
@@ -41,7 +41,7 @@ python-editor==1.0.3
 python-mimeparse==1.6.0
 python-subunit==1.0.0
 pytz==2013.6
-PyYAML==3.12
+PyYAML==3.13
 requests==2.14.2
 requestsexceptions==1.2.0
 rfc3986==0.3.1

setup.cfg

@@ -27,7 +27,7 @@ mysql =
     PyMySQL>=0.7.6 # MIT License
 # or oslo.db[postgresql]
 postgresql =
-    psycopg2>=2.7.0 # LGPL/ZPL
+    psycopg2>=2.8.0 # LGPL/ZPL
 
 [files]
 packages =

test-requirements.txt

@@ -13,4 +13,4 @@ testtools>=2.2.0 # MIT
 bandit>=1.6.0,<1.7.0 # Apache-2.0
 pifpaf>=0.10.0 # Apache-2.0
 PyMySQL>=0.7.6 # MIT License
-psycopg2>=2.7.0 # LGPL/ZPL
+psycopg2>=2.8.0 # LGPL/ZPL