The code failed to ensure that "s" is within the buffer passed for
parsing when checking for "ms", and this resulted in unexpected errors when
parsing non-null-terminated strings with trailing "m".  The bug manifested
itself when the expires directive was used with variables.

Found by Roman Arutyunyan.

The option disables sending hostname in the syslog message header.  This is
useful with syslog daemons that do not expect it (tickets #677 and #783).

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

This change fixes the "comparison between signed and unsigned integer
expressions" warning, introduced in 5e6142609e48 (1.9.4).

The code for displaying version info and configuration info seemed to be
cluttering up the main function. I was finding it hard to read main. This
extracts out all of the logic for displaying version and configuration info
into its own function, thus making main easier to read.

The SPDY support is removed, as it's incompatible with the new module.

A configuration like

    server { server_name .foo^@; }
    server { server_name .foo; }

resulted in a segmentation fault during construction of server names hash.

Reported by Markus Linnala.
Found with afl-fuzz.