OFStateManager: remove shorthand logging macros

Newer portions of OFStateManager already use the AIM macros directly.
Standardize on that.
OFStateManager: downgrade some INFO logs to VERBOSE

These logs are not useful for a user. The only INFO log left is "Setting
switch DPID to ...".
OFStateManager: call AIM_DIE on LOCI memory allocation failure

This matches the behavior of aim_malloc. I also standardized the message
phrasing.
OFStateManager: downgrade some WARN/ERROR logs to INTERNAL

These logs imply bugs in our code that aren't serious enough for AIM_DIE. We
don't expect them to ever be hit. This is in contrast to the remaining
WARN/ERROR logs which can be triggered by the controller.
OFStateManager: remove TRY macros

The ERROR logs produced by these macros were not user-friendly, and needed to
be INTERNAL logs anyway.
OFStateManager: improve text of INFO, WARN, and ERROR log messages

I added some context to a few messages. I also fixed format string
inconsistencies with the arguments.
OFStateManager: add message name to several gentable log messages
Merge into master from pull request #165:
First pass of logging cleanup for OFStateManager (https://github.com/floodlight/indigo/pull/165)
OFConnectionManager: use AIM_LOG_* directly
OFConnectionManager: remove unused NO_CXN_LOG_VERBOSE macro
OFConnectionManager: remove unused preferred_cxn_id
OFConnectionManager: add an INFO log when a controller connects

Defined as the main connection sending a features reply. I also changed the
existing controller disconnect message to match.
OFConnectionManager: upgrade a couple of logs to WARN
OFConnectionManager: AIM_DIE on memory allocation failures
OFStateManager: fix DPID log statement

It was logging as 32 bits.
OFConnectionManager: tweak log levels

I used a few simple rules:

1. We expect it and it was our fault: ERROR
2. We don't expect it and it was our fault: INTERNAL
3. It wasn't our fault: WARN
4. Not worth going to syslog: VERBOSE
OFConnectionManager: remove unused _TRY macro
SocketManager: convert impossible warning to AIM_DIE
SocketManager: standardize on AIM_LOG_* logging macros
SocketManager: move most ERROR logs to INTERNAL

I think all of these could actually be assertions, but that would be too risky
for now.