Use request.start and end
Without the start and end we die on 'assert self.in_request' in the
core per request value store methods.
from django.db.backends import BaseDatabaseClient
from django.conf import settings
import os
class DatabaseClient(BaseDatabaseClient):
executable_name = 'sqlite3'
def runshell(self):
args = ['', settings.DATABASE_NAME]
os.execvp(self.executable_name, args)