Allow meta tags to be provided in seldon_client

[ukclivecox]

Fixes #821

[axsaucedo]

/test lint

[axsaucedo]

It seems the linter would reformat: would reformat /workspace/source/python/tests/test_seldon_client.py would reformat /workspace/source/python/seldon_core/seldon_clien
If you run make -C python/ run_linter it should add it (also activating the pre-commit-hook would do), other than that looks solid

[seldondev]

Mon Dec 9 15:57:12 UTC 2019
The logs for [pr-build] [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-1096/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1096 --build=6

[seldondev]

Mon Dec 9 15:57:24 UTC 2019
The logs for [lint] [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-1096/7.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1096 --build=7

[seldondev]

Mon Dec 9 17:24:00 UTC 2019
The logs for [pr-build] [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-1096/8.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1096 --build=8

[seldondev]

Mon Dec 9 17:24:13 UTC 2019
The logs for [lint] [9] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1096/9.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1096 --build=9

[axsaucedo]

/approve
/lgtm

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

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[seldondev]

Mon Dec 9 22:26:33 UTC 2019
The logs for [lint] [11] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1096/11.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1096 --build=11

[seldondev]

Mon Dec 9 22:26:46 UTC 2019
The logs for [pr-build] [10] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1096/10.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1096 --build=10