cobbler: Just output to ttyS1

cobbler: Just output to ttyS1

This covers all baremetal types except mira.  Cheetah/Cobbler templating
was breaking with commit
https://github.com/ceph/ceph-cm-ansible/pull/389/commits/de871c037f4ae227bed00933eee24f849a4551b0.

The problem is if there is more than one kernel option type (like
console, ksdevice, etc.), $kernel_options gets expanded into a json
dictionary and breaks the templating.

E.g., {'ksdevice': 'bootif', 'lang': ' ', 'console': ['tty0', 'ttyS1,115200'], 'text': None, 'netcfg/choose_interface': 'auto'}

Rather than fight with that, we'll just output to ttyS1.

Signed-off-by: David Galloway <dgallowa@redhat.com>