Use extra data structure in json alert output
to store local configuration
json-http: refactoring output code

Splits the output code in two public functions and permits
to call them from the alert function
json-alert: include HTTP info on the alerts

Extends the JSON alert output to include the HTTP data
at the time of the alert.
alert-json: clean up flags

Make payload/packet logging code also use the flags field in
AlertJsonOutputCtx, instead of in the LogFileCtx.
lua: improve configure checks

The base 'lua' library has different names on different OS' and even
Linux distro's. Instead of selecting the proper one, we now just try
all. This way no OS/distro specific knowledge about the name is needed.
Add Packed attribute on Header structures

Structures that are used to cast packet data into fields need to be packed
so that the compiler doesn't add any padding to these fields. This also helps
Tile-Gx to avoid unaligned loads because the compiler will insert code to
handle the possible unaligned load.
More structures that need to be marked Packed.

These structures are cast from raw packet data, so they should be packed.
The case is:

typedef struct Foo_ {
} Foo;

Foo *f = (Foo *)pkt;
Fix GRE Source Routing Header definition

The Source Routing Header had routing defined as a char* for a field
of variable size. Since that field was not being used in the code, I
removed the pointer and added a comment.
Update Changelog for 2.0.3
Update Changelog for 2.1beta1
Fix decode tests calling PACKET_DO_RECYCLE instead of PACKET_RECYCLE
packet recycle: split macro

Split PACKET_RECYCLE into 2 parts. One part for cleanup to do before a
packet is returned to the pool, the other after it's retrieved from
the pool.
packet recycle: do most clean up on packet reuse

Call PACKET_RELEASE_REFS from PacketPoolGetPacket() so that
we only access the large packet structure just before actually
using it. Should give better cache behaviour.
packet recycle: remove mutex destroy/init

This was necessary earlier when there was a memset involved.
packet pool: fix ext_pkt cleaning

The field ext_pkt was cleaned before calling the release function.
The result was that IPS mode such as the one of AF_PACKET were not
working anymore because they were not able to send the data which
were initially pointed by ext_pkt.

This patch moves the ext_pkt cleaning to the cleaning macro. This
ensures that the cleaning is done for allocated and pool packets.
Optimize Packet Ext data freeing

Move the logic of PacketFreeExtData into a macro 'PACKET_FREE_EXTDATA'.
It was called for each packet.
Simple code fixes
- Removed unnecessary assignment of the data field
- Removed else condition (same function called for IPv4 and IPV6)
- Fixed constants to be a power of two (used in bitwise operations)
Fix compiler warning about uninitialized variable in mpipe.