Ignore dotfiles in profile includedir

Editors and filesystems may create artifacts related to .conf files
which don't change the file suffix; these artifacts generally begin
with "." so that they don't appear in normal directory listings
(e.g. ".#filename" for emacs interlock files).  Make sure to ignore
any such artifacts when processing a profile includedir directive.

(cherry picked from commit e8e1d841f8e43e4f441b451d91333a01e43c1b6f)

https://github.com/krb5/krb5/commit/06ad6810d86641489e2c05be0a74aeef36811be9
Author: Greg Hudson <ghudson@mit.edu>
Commit: 06ad6810d86641489e2c05be0a74aeef36811be9
Branch: krb5-1.15
 doc/admin/conf_files/krb5_conf.rst |    7 ++++---
 src/util/profile/prof_parse.c      |    6 +++++-
 2 files changed, 9 insertions(+), 4 deletions(-)