Add more default metrics for Python topology

[objmagic]

This patch adds more default metrics for Python topology, namely:

'__gateway-sent-metrics-size'
'__gateway-sent-metrics-packets-count'
'__gateway-sent-metrics-count'
'__gateway-sent-exceptions-count'
'__gateway-in-stream-queue-size'
'__gateway-out-stream-queue-size'
'__gateway-in-stream-queue-expected-capacity'
'__gateway-out-stream-queue-expected-capacity'
'__gateway-in-queue-full-count'

This PR also adds a half-acking topology example.

related to #1264

[kramasamy]

@taishi8117 - if you could take a look at this, it will be awesome.

[kramasamy]

it looks fine to me 👍

[kramasamy]

let us wait until @taishi8117 gives feedback.

[taishi8117]

maybe change the variable name to half_ack_bolt?

[taishi8117]

@kramasamy @objmagic I made some comments, but other than that, this PR looks fine to me.

[objmagic]

@taishi8117 I have addressed your comments in the latest commit.

[objmagic]

seems integration test is very unstable. restarted CI...

[kramasamy]

Can you identify which integration test is unstable?

On Aug 30, 2016, at 10:04 AM, Mark Li notifications@github.com wrote:

seems integration test is very unstable. restarted CI...

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[objmagic]

seems to me each one of them failed before (retried > 25 times)

[objmagic]

restarted CI and now it's fine.