mark model metadata in python wrapper as incubating feature in 1.1 docs

[RafalSkolasinski]

Remove metadata from 1.1 documentation as this will be rapidly evolving now in most-likely backward incompatible way.

May point is that right now we seemed to allow user to return from metadata method anything as long as it is dict and serve it on /metadata whereas model metadata will be very well structured in context of #1638

[seldondev]

Wed Apr 1 08:44:05 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-1649/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1649 --build=1

[seldondev]

Wed Apr 1 08:44:15 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-1649/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1649 --build=2

[RafalSkolasinski]

Alternatively instead of removing the note we could make it clear that this is a beta feature.

[axsaucedo]

@RafalSkolasinski that's a good idea actually, we do have already the "incubating" features, so we could actually move it into the "incubating section" for this release

[seldondev]

Thu Apr 2 09:37:22 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-1649/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1649 --build=4

[seldondev]

Thu Apr 2 09:37:49 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-1649/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1649 --build=3

[axsaucedo]

/approve

[seldondev]

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