[Click] socket.cc patch

[Mark Huang]

Eddie Kohler wrote:
>> I have a couple of additional patches to Socket that I need to post, 
>> that simplifies the polling loop in run_task() and gets rid of the 
>> backoff timer, which I copied from ToDevice without really knowing why 
>> it was necessary. All that the backoff timer did was reduce 
>> performance in some of our PlanetLab experiments by 20-30%.

This change (among others) is encompassed in click-socket.patch. Along with a 
minor change to click/lib/master.cc (click-gettimeofday.patch), we were able to 
reduce syscall overhead significantly in many of our experiments. I also made a 
couple of changes to enable the Socket code to be reused by UMLSwitch 
(click-umlswitch.patch).

I was able to reproduce Beyer's hard lock, it looks like some sort of massive 
memory leak in Socket(TCP); if I didn't have 3 GB of RAM on my dev box, it 
probably would have swapped itself to death, too. I'll look into this separately 
since my patch doesn't seem to fix it or make it any worse.

Other random patches which you may or may not want to apply:

click-daemon.patch: enable userlevel Click to run as a background daemon

click-icmppingrewriter.patch: reset IP destination annotation

click-reframe.patch: pull encapsulated packets out of a TCP stream

click-fromhost.patch: add "Proper" support (PlanetLab specific). Support 
pre-configured ("static") TUN/TAP interfaces by specifying a
0.0.0.0 destination IP address.

click-proper.patch: add "Proper" support (PlanetLab specific)

click-umlswitch.patch: add a UMLSwitch element for interfacing with UML's 
uml_switch daemon.

click-rawsocket.patch: add "Proper" support (PlanetLab specific)
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