Add kernel_ml options to cobbler scripts

Add support to pass ks_meta kernel_ml = 1 to cobbler. This will cause the package
 kernel-ml to be added in the CentOS profile.

kernel-ml is the Fedora main-line kernel and might be desired in some cases to help
 prevent vlan splinters issues for some network cards.

Closes-bug: #1263072
Related-bug: #1282493

Change-Id: I0d65b0b64feea05c413c86d37c30d9ccabf870c8
Merge "Add kernel_ml options to cobbler scripts"