Remove static variable disk usage metadata filename
Description
Recently we experienced a few segfaults in buildbox-casd, which was related to the static variable s_disk_usage_metadata_filename
being destructed before s_daemon
When s_daemon
is destructed is uses the above static value here, which might have been destructed before
Changes proposed in this merge request:
- Make
s_disk_usage_metadata_filename
non static instance variable so it is not deterministically not destructed before