merging Zheng's changes from esap-gateway-auth into easp-gateway-dev

esap/Dockerfile

esap/accounts/__init__.py

esap/accounts/admin.py

esap/accounts/api/__init__.py

esap/accounts/api/serializers.py

esap/accounts/api/urls.py

esap/accounts/api/views.py

esap/accounts/apps.py

esap/accounts/migrations/__init__.py

esap/accounts/models.py

esap/accounts/tests.py

esap/accounts/urls.py

esap/accounts/views.py

esap/api/business/services/query/alta.py

esap/api/business/services/staging/staging_base.py

esap/api/templates/api/index.html

esap/esap/configuration/adex.py

esap/esap/configuration/esap_default.py

esap/esap/configuration/esap_dev.py

esap/esap/settings/base.py