[RHEL/6] Add remediations for requirements /dev/shm to be mounted with nodev, noexec, and nosuid mount options
[RHEL/6] mount_option_dev_shm remediation fixes - quieten the grep calls,
so running the remediation(s) in shell doesn't display side output. Fixes:
https://github.com/OpenSCAP/scap-security-guide/pull/326#issuecomment-62173616
Merge pull request #326 from iankko/rhel6_add_mount_option_dev_shm_remediations

[RHEL/6] Add remediations for requirements /dev/shm to be mounted with nodev, noexec, and nosuid mount options