Use python 3.10 in unit tests with latest tosca-parser

... because Python 3.7 is no longer tested. Python 3.10 is selected
from the supported runtime versions because it's the default python
version in Ubuntu Jammy.

This also fixes a few problems causing failure in the test.

Change-Id: Ida855a8438fe980998240c5f09cf7826b9ca78dc

.zuul.yaml

@@ -10,11 +10,11 @@
             voting: false
 
 - job:
-    name: heat-translator-tox-py37-tp
-    parent: openstack-tox-py37
+    name: heat-translator-tox-py310-tp
+    parent: openstack-tox-py310
     description: |
       Run tests for heat-translator project.
 
-      Uses tox with the ``py37-tp`` environment.
+      Uses tox with the ``py310-tp`` environment.
     vars:
-      tox_envlist: py37-tp
+      tox_envlist: py310-tp

tox.ini

@@ -43,10 +43,12 @@ commands =
     oslo_debug_helper -t translator/hot/tests {posargs}
     oslo_debug_helper -t translator/hot/tosca/tests {posargs}
 
-[testenv:py37-tp]
-basepython = python37
+[testenv:py310-tp]
+basepython = python310
+allowlist_externals =
+    bash
 commands =
-    ./run_py-tosca-parser-master.sh
+    bash ./run_py-tosca-parser-master.sh
     python setup.py test --slowest --testr-args='{posargs}'
 
 [flake8]