Filesystem Permissions Break Functionality #53

Certain file permissions break when mounting the bind mounts to a non-user owned folder (e.g. /srv) and using peerstash commands without sudo.

• peerstash setup fails to generate the restic password without sudo
• peerstash restore cannot restore into the /mnt/peerstash_restore folder without sudo
• peerstash restore cannot delete the /tmp/peerstash/restore folder if it was previously run with sudo
• peerstash mount cannot mount into /tmp/peerstash_mnt folder without sudo
• peerstash unmount does not complete without sudo

PR #52 aims to fix these issues.