Request logging and statistics

[allmightyspiff]

Allow users to opt-in to logging Api requests for debug / error reporting purposes.

Step 1:

Turn on logging in the .softlayer config file.
Should have options for

• Where to log
• Log API Service and Method
• Log API request (data being sent)
• Log API response code
• Log API response ( data being received)
• Log start + finish time

Step 2

keep logs in either plain text or sql light format, not sure what I want to do just yet.

[allmightyspiff]

thoughts:
create a transport wrapper that moves the logging out of the actual transport. along with keeping track of how long api calls take and any results returned.

[rlrossiter]

At least from a timing standpoint, there's already a transport for it https://github.com/softlayer/softlayer-python/blob/master/SoftLayer/transports.py#L337

And for the logging, if you turn on info/debugging (or use -vvvv on slcli), you'll get a dump of the request and response payloads (tons of XML, so it not super useful)

[allmightyspiff]

What I'm trying to do is make that logging a bit more useful, rather than just spamming XML all over the terminal.

I've been playing around with some things in https://github.com/allmightyspiff/softlayer-python/blob/issues909/SoftLayer/transports.py but so far I don't think I've come up with a logging system I like.

[allmightyspiff]

added in #960