Add PR build message to integration tests run

[gsunner]

for #1200

[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[seldondev]

Thu Dec 5 14:59:12 UTC 2019
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-1201/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1201 --build=1

[seldondev]

Thu Dec 5 14:59:14 UTC 2019
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-1201/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1201 --build=2

[gsunner]

/test integration

[seldondev]

Thu Dec 5 15:02:15 UTC 2019
The logs for [integration] [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-1201/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1201 --build=3

[seldondev]

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

Test name	Commit	Details	Rerun command
integration	a13abc9	link	/test integration

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