Fixing templates to refer to variables properly.

While installing katello 'community' nighty today I noticed a few errors
related to how certain variables were being refered to in a couple of
templates:

```bash
Variable access via 'fqdn' is deprecated. Use '@fqdn' instead.
template[/usr/share/katello-installer/modules/certs/templates/rhsm-katello-reconfigure.erb]:19
Variable access via 'fqdn' is deprecated. Use '@fqdn' instead.
template[/usr/share/katello-installer/modules/pulp/templates/etc/pulp/server.conf.erb]:40
Variable access via 'processorcount' is deprecated. Use
'@processorcount' instead.
template[/usr/share/katello-installer/modules/pulp/templates/etc/pulp/server.conf.erb]:282
```

This pull request should fix these variables but it does not, however,
solve the last of the issues:

```bash
ruby 1.8.7 (2011-06-30 patchlevel 352) sh: line 1:  3366 Done
echo '$kafo_config_file="/etc/katello-installer/katello_installer.yaml"
$kafo_answer_file="/tmp/kafo_answers_983597.yaml"  include
kafo_configure'

3367 Aborted                 (core dumped) |
RUBYLIB=/usr/lib/ruby/gems/1.8/gems/kafo-0.5.3/lib/kafo/../..//modules:
puppet apply --verbose --debug --trace --color=false --show_diff
--detailed-exitcodes --modulepath
/usr/share/katello-installer/modules:/usr/lib/ruby/gems/1.8/gems/kafo-0.5.3/modules

Puppet has finished, bye!
```