yaml: add eve flow and netflow entries

Added, commented out by default.

Bug #1257.
output-lua: add script-dir config param

Add 'scripts-dir' config directive that is prepended to the script
names to form a path. If ommited or empty, script are opened from
the CWD.
output-lua: add config to yaml

Disabled by default.
output-lua: set proper callbacks for HTTP

Enable the relevant HTTP callbacks.

Bug #1287
flow: fix flow logging at shutdown

Move all flows from the hash to the recycler at shutdown.

Bug #1260
flow json log: add 'shutdown' as flow end reason

When engine shuts down all flows in the hash are logged out. They
may not have timed out yet. So they are forced. Log the reason to
be 'shutdown'.
filestore: fix parsing bug

Filestore keyword can have options or no options, and the parser
was enforcing the NOOPT flag too strictly.

Bug #1288
Don't require an action-order configuration section. If not present,
use the defaults.
Comment out in the action-order section, as its not needed if
the default configuration is used.
lua detect: expose stream payload

Allow a script to set the 'stream' buffer type. This will add the
script to the PMATCH list.

Example script:
alert tcp any any -> any any (content:"html"; lua:stream.lua; sid:1;)

    function init (args)
        local needs = {}
        needs["stream"] = tostring(true)
        return needs
    end

    -- return match via table
    function match(args)
        local result = {}

        b = tostring(args["stream"])
        o = tostring(args["offset"])

        bo = string.sub(b, o);
        print (bo)

        return result
    end

    return 0
runmode-pfring: Suppress errors when using DNA/ZC

PF_RING DNA/ZC don't use cluster-id and cluster-type. Therefore,
skip setting these values if DNA/ZC is being used.

Bug #1048
runmode-pfring: Fixed typo s/fron/from/
configure.ac: Moved libpcap before libpfring

Moved the libpcap section in configure.ac before libpfring to
enable libpfring to use the specified libpcap includes and
libraries when testing for libpfring support.

Bug #1294