Fix protocols_example

[RafalSkolasinski]

What this PR does / why we need it:

Fixes two notebooks that were recently failing in CI:

• custom_metrics -> flakiness, increased sleep time as temporary measure
• protocols_example -> missing Protocol: TCP

Which issue(s) this PR fixes:

Fixes #2569

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None

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[RafalSkolasinski]

/test notebooks

[seldondev]

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[seldondev]

Wed Oct 21 13:13:16 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2564/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2564 --build=1

[seldondev]

Wed Oct 21 13:13:21 UTC 2020
The logs for [notebooks] [3] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2564/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2564 --build=3

[seldondev]

Wed Oct 21 13:13:26 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2564/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2564 --build=2

[RafalSkolasinski]

hmmm... seems custom_metrics one is still flaky...

[RafalSkolasinski]

/test notebooks

[seldondev]

Wed Oct 21 16:04:43 UTC 2020
The logs for [notebooks] [4] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2564/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2564 --build=4

[seldondev]

@RafalSkolasinski: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
notebooks	03928db	link	/test notebooks

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[RafalSkolasinski]

Well... I am afraid that this PR is fixing only the protocols_example in the end...

[RafalSkolasinski]

The notebook that was meant to be fixed got fixed, we should merge it