Windows: terminate HOSTS/LMHOSTS with newline

Windows: terminate HOSTS/LMHOSTS with newline

If the original file did not terminate with a newline,
add one before appending the "AFS" entry.

FIXES 130210

Reviewed-on: http://gerrit.openafs.org/6375
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
(cherry picked from commit 2d8f9141fa98df50ce682364ef5a7958ce422613)

Change-Id: I1a95a42b420b4695b52ae0c2e2de46cd97a5294a
Reviewed-on: http://gerrit.openafs.org/6817
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>