Maid 198 drive filesystem test torn down issue

https://maidsafe.atlassian.net/browse/MAID-198

double free issue during testing environment torn down is resolved
termination and dump file issue during testing environment torn down is resolve
LOG is committed accidentally

The Sleep does helped in removing a fuse error to be removed.
However, due to a later on commit, such error becomes non-critical and won't cause any trouble.
(just sometime there will be an annoying fuse error message to be printed out)

If Sleep shall be avoided by the best,
it can be removed from this place