Add a service permission for uploading documents to Document Download

Service permission allows attaching a file to a notification API request
that gets uploaded to Document Download API.

migrations/versions/0182_add_upload_document_perm.py

@@ -0,0 +1,24 @@
+"""empty message
+
+Revision ID: 0182_add_upload_document_perm
+Revises: 0181_billing_primary_key
+Create Date: 2018-03-23 16:20:00
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0182_add_upload_document_perm'
+down_revision = '0181_billing_primary_key'
+
+from alembic import op
+
+
+def upgrade():
+    op.get_bind()
+    op.execute("insert into service_permission_types values('upload_document')")
+
+
+def downgrade():
+    op.get_bind()
+    op.execute("delete from service_permissions where permission = 'upload_document'")
+    op.execute("delete from service_permission_types where name = 'upload_document'")