Clean up duplicated code for types and webhooks

[ukclivecox]

Fixes #1294

[ukclivecox]

/test integration

[seldondev]

Thu Dec 19 19:35:10 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-1296/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1296 --build=1

[seldondev]

Thu Dec 19 19:35:19 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-1296/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1296 --build=2

[seldondev]

Thu Dec 19 19:35:42 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-1296/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1296 --build=3

[ukclivecox]

/test integration

[seldondev]

Fri Dec 20 09:18:35 UTC 2019
The logs for [integration] [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-1296/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1296 --build=4

[ryandawsonuk]

/lgtm
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

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