openshift.ks: Delete redundant nl variable

configure_named: Delete the ${nl} variable from several echo statements.
The echo command already prints a newline, and ${nl} is undefined, so it
was expanding to an empty string anyway.
openshift.ks: Delete NAMED_ENTRIES

configure_named: Instead of setting NAMED_ENTRIES=${CONF_NAMED_ENTRIES}
and then using NAMED_ENTRIES, just use CONF_NAMED_ENTRIES directly.
openshift.ks: Clean up repo config comments

Delete comments for configure_*_repo functions, most of which state the
obvious, and a couple of which are wrong.

Add comments to configure_repos when defining need_*_repo to explain _why_
we configure particular repos.
Merge pull request #72 from Miciah/openshift.ks-clean-up-comments-on-repo-config

openshift.ks: Clean up repo config comments
Merge pull request #73 from Miciah/openshift.ks-delete-redundent-nl-variable

openshift.ks: Delete redundant nl variable
Merge pull request #74 from Miciah/openshift.ks-delete_NAMED_ENTRIES-use-CONF_NAMED_ENTRIES

openshift.ks: Delete NAMED_ENTRIES