Fix mount errors

[paul-nortal]

This is a fix for the following 2 errors:

• The partner1/partner2 -l params to runuser don't map to users in users.conf
• The lack of chmod 666 /dev/fuse was causing this an error:

[/entrypoint] Running /etc/sftp.d/gcs-mounts.sh ...
Using mount point: /home/user1/ftp
Opening GCS connection...
Opening bucket...
Mounting file system...
daemonize.Run: readFromProcess: sub-process: mountWithArgs: mountWithConn: Mount: mount: running fusermount: exit status 1

stderr:
fusermount: failed to open /dev/fuse: Permission denied

/entrypoint: Error on line 81: $f

[paul-nortal]

@mikeghen thanks for putting that together! It helps..