Install system packages from production.

Closes devops#131

See merge request rc/packer-openstack-hpc-image!12

The kernel-devel version installed should strictly match the
kernel version otherwise the symlink is broken and installer
can't find the header files to compile the driver.

Feat install zsh

Closes #25

See merge request rc/packer-openstack-hpc-image!16

Add LMOD tracking

Closes #24

See merge request rc/packer-openstack-hpc-image!15

This reverts commit d99aac38.

Add role to restrict user access to nodes via pam_slurm.

Closes #26

See merge request rc/packer-openstack-hpc-image!14