Fixing permissions on the temp dir used by cvmfs_receiver
Fixing permissions on the temp dir used by cvmfs_receiver

The temp dir was created with permissions 666, making it only accessible
to the root user. Changing permissions to 770.

cvmfs/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs