Enable TLS only if the ldap_uri var is having https substring in the
value

A proxy node need not be a slurm client so we don't run this role

We changed it to "all" because that's the convention we follow.
When running ansible playbook you need to limit the hosts with -l
so that it doesn't run on all hosts.

Some background on why it was set to default in the first place,
`hosts: default` is used as a placeholder during development
to indicate where actual host groups will later be defined.
You can define specific host groups within the inventory
file with names that are more relevant to your infrastructure,
replacing the "default" placeholder.

We parameterized a few tasks in the cheaha.yml and put the vars in
group_vars/all so that the existing knightly builds won't break.
We added values required for the CoD deploy in group_vars/proxy. Now if
we put the proxy nodes in proxy group they will inherit values meant for
CoD deploy which is not desired in production.
We later realized that the appropriate file is group_vars/knightly and
it gives flexibility to put proxy nodes in knightly group to override
the vars meant for CoD in group_vars/all.

This will enable a standalone VM to interact with cluster so it can act
as a proxy for services. eg. OOD,SSH etc.

Fix centos yum repo

See merge request rc/packer-openstack-hpc-image!89

Add timestamps in user date

See merge request rc/packer-openstack-hpc-image!88

Fix integration project separation

Closes #116

See merge request rc/packer-openstack-hpc-image!87

Since the job only run in schedule pipeline after !74 merged

Fix race condition

Closes #99

See merge request rc/packer-openstack-hpc-image!85

Fix(cleanup_knightly): Remove unnecessary backslash

See merge request rc/packer-openstack-hpc-image!86

fix: keep last running instance

Closes #115

See merge request rc/packer-openstack-hpc-image!84

Sleep 20 second before running test

Closes #99

See merge request rc/packer-openstack-hpc-image!83

Print out deleting image/server ID

See merge request rc/packer-openstack-hpc-image!82

Split image clean up job to integration project

Closes #114

See merge request rc/packer-openstack-hpc-image!81

Move build pipeline out to integration project

Closes #106

See merge request rc/packer-openstack-hpc-image!74