Add Comment for HTTP basic authentication.

The options is boolean, header name is  'X-Ldap-DisableReferrals' and
the command-line switch is '--disable-referrals', default value is
false.

create missing etc/logrotate.d directory in buildroot

This is a rebased version and slightly modified version of patch submitted by
Matthieu Cerda <matthieu.cerda@gmail.com> via pull-request #29
(https://github.com/nginxinc/nginx-ldap-auth/pull/29)

The correct name starts with the lowercase 's'.

https://msdn.microsoft.com/en-us/library/ms679635

When a nginx-ldap-auth-daemon.py is executed from console, its output
is set to /dev/stdout by default.  Otherwise, value of a 'LOG' variable is
used, exported by wrapper script.

Exit on SIGTERM for Kubernetes, print startup message

Fixed logging and typo for bind DN argument

Fixed a typo in .service file and fixed missing file in .install

Quoted-string Basic realm ctx according to rfc7235

Hi,

I faced some problems with 401 message and an Android client.

It yelded because in the WWW-Authenticate header the
Basic ream=<ctx>
wasn't surrouned by ""

In the https://tools.ietf.org/html/rfc7235 it is written that 
 - Authentication parameters are name=value pairs
 - and "auth-param     = token BWS "=" BWS ( token / quoted-string )"
 - and "For historical reasons, a sender MUST only generate the quoted-string
   syntax.  Recipients might have to support both token and
   quoted-string syntax for maximum interoperability with existing
   clients that have been accepting both notations for a long time."

After my modification, the Android worked again (and iOs and PC clients faicing the 401 still worked ;) )

BR,
Arfy

cli options for the daemon and basic debian packaging

Added systemd service file and rpm spec file

This service file assumes nginx-ldap-auth-daemon.py was installed to
/usr/bin under the name of nginx-ldap-auth-daemon.

Minor bugfixes

Minor bugfixes: password can now contain colons, log_message uses self.ctx (instead of global ctx, which does not exist)

Commit 06444b36 changed returned error
code from 403 to 401 in case of failed auth and documentaion must be
updated accordingly.

Use RFC2616 recommandation to reply 401 instead on 403 for auth_failed

self.ctx may be unset in case of bad request or other low-level error.