Switch to pytests, add a tiny bit of smoke test coverage to get something coverage no longer gets

script/coverage

@@ -36,7 +36,9 @@ grep -r -I --line-number "# pragma: +no.*cover" octodns && {
   exit 1
 }
 
-coverage run --branch --source=octodns --omit=octodns/cmds/* "$(command -v nosetests)" --with-no-network --with-xunit "$@"
+export PYTHONPATH=.:$PYTHONPATH
+
+coverage run --branch --source=octodns --omit=octodns/cmds/* "$(command -v pytest)" --disable-network "$@"
 coverage html
 coverage xml
 coverage report --show-missing

script/test

@@ -30,4 +30,6 @@ export ARM_CLIENT_SECRET=
 export ARM_TENANT_ID=
 export ARM_SUBSCRIPTION_ID=
 
-nosetests --with-no-network "$@"
+export PYTHONPATH=.:$PYTHONPATH
+
+pytest --disable-network "$@"