Make the pytest options consistent

* use ~/junit rather than /root/junit

use the common options in the pytest call

put the split options in the runtime call

.circleci/config.yml

@@ -23,7 +23,7 @@ defaults:
     # Tests Backend, split across containers by segments
     run: |
       mkdir -p ~/junit/result
-      python -m pytest -v --ckan-ini=test-core-circle-ci.ini --cov=ckan --cov=ckanext --junitxml=/root/junit/result/junit.xml --splits 4 --group $((CIRCLE_NODE_INDEX+1)) --splitting-algorithm least_duration
+      python -m pytest ${PYTEST_COMMON_OPTIONS} --splits 4 --group $((CIRCLE_NODE_INDEX+1)) --splitting-algorithm least_duration
 
   ckan_env: &ckan_env
     environment:
@@ -36,7 +36,7 @@ defaults:
       CKAN_POSTGRES_USER: ckan_default
       CKAN_POSTGRES_PWD: pass
       PGPASSWORD: ckan
-      PYTEST_COMMON_OPTIONS: -v --ckan-ini=test-core-circle-ci.ini --cov=ckan --cov=ckanext --junitxml=/root/junit/result/junit.xml --test-group-count 4  --test-group-random-seed 1
+      PYTEST_COMMON_OPTIONS: -v --ckan-ini=test-core-circle-ci.ini --cov=ckan --cov=ckanext --junitxml=~/junit/result/junit.xml
   pg_image: &pg_image
     image: postgres:10
     environment: