Use production server by default

[adriangonz]

Fixes #1993

Changelog

• Run Gunicorn by default with 1 worker and 10 threads
• Add --threads / GUNICORN_THREADS flags to control number of threads
• Add --debug / SELDON_DEBUG flags to enable Flask's development server
• Apply the same above to the metrics server
• Update docs

Changed Python wrapper so that it runs Gunicorn with a single worker by default.
Added `GUNICORN_THREADS` environment variable to control the fixed number of threads on each Gunicorn worker. 

[adriangonz]

/cc @RafalSkolasinski @axsaucedo

[seldondev]

Mon Jun 29 15:24:27 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-2047/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=1

[seldondev]

Mon Jun 29 15:24:38 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-2047/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=2

[adriangonz]

/test integration
/test notebooks

[seldondev]

Thu Jul 2 08:52:56 UTC 2020
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-2047/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=4

[seldondev]

Thu Jul 2 08:53:24 UTC 2020
The logs for [notebooks] [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-2047/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=3

[axsaucedo]

Seems ambassador install failed, strange...
/test integration

[seldondev]

Thu Jul 2 13:11:18 UTC 2020
The logs for [integration] [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-2047/5.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=5

[seldondev]

@adriangonz: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
notebooks	984345a	link	/test notebooks
integration	984345a	link	/test integration

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[adriangonz]

/test integration

[seldondev]

Mon Jul 6 09:26:47 UTC 2020
The logs for [integration] [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-2047/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=6

[adriangonz]

/test integration

[seldondev]

Mon Jul 6 14:58:48 UTC 2020
The logs for [integration] [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-2047/7.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=7

[adriangonz]

/test notebooks

[seldondev]

Mon Jul 6 15:07:34 UTC 2020
The logs for [notebooks] [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-2047/8.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=8

[axsaucedo]

/test integration

[seldondev]

Tue Jul 7 12:18:40 UTC 2020
The logs for [integration] [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-2047/9.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=9

[axsaucedo]

/test integration

[seldondev]

Tue Jul 7 12:31:21 UTC 2020
The logs for [integration] [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-2047/10.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2047 --build=10

[axsaucedo]

Integration tests have passed

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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