Updating ISO installer for Satellite.

Fixes Bugzilla #1098241.

Since some packages have been renamed and there's no 'katello-all'
package or 'katello-configure', I have updated the installer script to
look for Foreman-specific packages when installing Katello.

```bash
This script will install the katello packages on the current machine.
   - Ensuring we are in an expected directory.
   - Copying installation files.
   - Creating a Repository File
   - Checking to see if Katello is already installed.
   - Importing the gpg key.
   - WARNING: Package GPG signatures will be ignored!
   - katello is not yet installed, installing it.
This system is receiving updates from Red Hat Subscription Management.
   - Installation repository will remain configured for future package installs.
   - Installation media can now be safely unmounted.

Install is complete. Please run katello-installer.
```
Merge pull request #32 from omaciel/update-for-sat6

Updating ISO installer for Satellite.