Some linux distros seem to alter TMPDIR environment variable and
therefore hamper qbt ability to find the lock files. So use config
folder instead of TMPDIR folder to create/locate the lock files.
Note that this change will also make qbt become one instance per-user
instead of one instance per-system.
Closes#15646.
Now it follows closely the definition of wildcard for glob patterns.
The backslash (\) character is not an escape char in this context.
In order to match one of the special characters, place it in square
brackets (for example, [?]).
