Authentication and authorization for seldon core requests example

[SachinVarghese]

Related to #1562

This PR adds an example of setting up auth for seldon core model deployments in an istio enabled Kubernetes cluster.

[seldondev]

Sun May 17 11:17:20 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-1834/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=1

[seldondev]

Sun May 17 11:17:36 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-1834/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=2

[axsaucedo]

@SachinVarghese this is awesome!!

It may be worth adding a page in the docs, or potentialyl just make this a page - really great to have this on the OSS!

[seldondev]

Mon May 18 08:37:30 UTC 2020
The logs for [lint] [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-1834/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=4

[seldondev]

Mon May 18 08:37:53 UTC 2020
The logs for [pr-build] [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-1834/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=3

[seldondev]

Thu May 21 11:17:32 UTC 2020
The logs for [pr-build] [5] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1834/5.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=5

[seldondev]

Thu May 21 11:17:32 UTC 2020
The logs for [lint] [6] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1834/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=6

[ukclivecox]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cliveseldon

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[seldondev]

Thu May 28 10:32:59 UTC 2020
The logs for [lint] [8] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1834/8.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=8

[seldondev]

Thu May 28 10:33:02 UTC 2020
The logs for [pr-build] [7] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1834/7.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1834 --build=7

[seldondev]

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

Test name	Commit	Details	Rerun command
pr-build	3368f15	link	/test this

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