Removed deprecated master/slave code

ckanext/odsh/helpers.py

ckanext/odsh/precondition.py

ckanext/odsh/templates/base.html

ckanext/odsh/tests/ckan_selenium.py

ckanext/odsh/tests/test_env.py

ckanext/odsh/tests/test_rdfexport.py

ckanext/odsh/tests/test_routes.py

ckanext/odsh/tests/test_selenium.py