Enhancement : add remote_addr in TCP access log

[panpan0000]

What this PR does / why we need it:

because source IP is essential for access log , not only for http logs ,but also for TCP logs.

original:
[18/Oct/2019:00:47:53 +0000] TCP 200 4333 81 0.002
new:
[10.6.***.202] [18/Oct/2019:01:05:15 +0000] TCP 200 4333 81 0.002

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #
No GH issue so far , if it's required, I will fire one.

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[panpan0000]

CLA is signed . @k8s-ci-robot

[panpan0000]

/assign @bowei

[aledbf]

/ok-to-test

[aledbf]

Please update the documentation about the format too https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#log-format-stream

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@@            Coverage Diff            @@
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  Coverage          ?   58.68%           
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  Files             ?       88           
  Lines             ?     6762           
  Branches          ?        0           
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  Hits              ?     3968           
  Misses            ?     2357           
  Partials          ?      437

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[aledbf]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, panpan0000

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[panpan0000]

Thank you for your reminder, @aledbf .

(1) I've add this change in configmap doc, in my second commit : ee24bf1

(2) regarding the Live doc (https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#log-format-stream), the original live doc is only about "HTTP log-format". The "TCP log-format" is not mentioned although, so I cannot fit my change into that doc :-(