Set the SQLite database lock timeout to 60 seconds which is the default in PHP anyways. I don't know why the MDB2 driver has this hardcoded to 0.1 seconds. This potentially fixes a lot of SQLite database lock problems and stuck in maintainance mode during upgrade issues.
Merge pull request #3329 from owncloud/increase_lock_timeout

Set the SQLite database lock timeout to 60 seconds which is the default ...