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..