Rolled the group config into the generic task

For some reason the configuration of the "AllowGroups" parameter
was being done in its own task despite being identical to the
more generic task.

I have rolled it into the more generic task to be cleaner.

Also some minor formatting improvements (imo)

Issue: IWSoftware/ekahau-rtls-playbook#1
Ticket: #5507

Signed-off-by: Nathan Callister <ncallister@iwsoftware.com.au>
Merge branch 'master' of github.com:IWSoftware/ssh-role

Issue: IWSoftware/ekahau-rtls-playbook#1

Signed-off-by: Nathan Callister <ncallister@iwsoftware.com.au>

Conflicts:
	tasks/main.yml