Cap jsonschema 3.2.0 as the minimal version

Previous versions of jsonschema (<3.2.0) doesn't support python 3.8 [1].
Python 3.8 is part of the victoria supported runtimes [2] so we now force
to use jsonschema version 3.2.0 to avoid issues, remove ambiguity and ensure
that everything works with python 3 in general.

[1] python-jsonschema/jsonschema#627
[2] https://governance.openstack.org/tc/reference/runtimes/victoria.html#python-runtimes-for-victoria

Change-Id: I743226241a94797c4c790cd09b03c3f7c2927457

Author: 4383

lower-constraints.txt

@@ -25,7 +25,7 @@ iso8601==0.1.11
 jmespath==0.9.0
 jsonpatch==1.16
 jsonpointer==1.13
-jsonschema==2.6.0
+jsonschema==3.2.0
 keystoneauth1==3.4.0
 linecache2==1.0.0
 mccabe==0.2.1

requirements.txt

@@ -5,7 +5,7 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 appdirs>=1.3.0 # MIT License
 cliff!=2.9.0,>=2.8.0 # Apache-2.0
 dogpile.cache>=0.6.2 # BSD
-jsonschema>=2.6.0 # MIT
+jsonschema>=3.2.0 # MIT
 keystoneauth1>=3.4.0 # Apache-2.0
 openstacksdk>=0.18.0 # Apache-2.0
 osc-lib>=1.10.0 # Apache-2.0