add python dependencies for SUIT

[kaspar030]

This PR adds needed dependencies for SUIT (RIOT-OS/RIOT#11818)

To test, make sure docker is correctly installed.

Then:

• check out this PR
• build the container (eg. docker build -t riotdocker_dev .)
• check out #11818
• from the checkout root, run riot (suit-pr)]$ docker run -ti --rm -v $(pwd):/data/riotbuild -u $(id -u) riotdocker_dev /bin/bash
• in the container, cd examples/suit_update; make suit/publish

It should succeed.
Otherwise this shouldn't affect anything, as this is only an addition of python packages.

[kaspar030]

Otherwise this shouldn't affect anything, as this is only an addition of python packages.

Basic functioning of the container is checked by Travis.

[fjmolinas]

I followed the testing procedure and got this error:

creating /data/riotbuild/examples/suit_update/bin/samr21-xpro/suit_update-slot0.1562671759.riot.bin...
creating /data/riotbuild/examples/suit_update/bin/samr21-xpro/suit_update-slot1.1562671759.riot.bin...
/data/riotbuild/dist/tools/suit_v4/gen_manifest.py \
  --template /data/riotbuild/dist/tools/suit_v4/test-2img.json \
  --urlroot coap://localhost/fw/samr21-xpro \
  --seqnr 1562671759 \
  --uuid-vendor "riot-os.org" \
  --uuid-class samr21-xpro \
  --offsets 0x1000,133120 \
  -o /data/riotbuild/examples/suit_update/bin/samr21-xpro/suit_update-riot.suitv4.1562671759.bin \
  /data/riotbuild/examples/suit_update/bin/samr21-xpro/suit_update-slot0.1562671759.riot.bin /data/riotbuild/examples/suit_update/bin/samr21-xpro/suit_update-slot1.1562671759.riot.bin
Traceback (most recent call last):
  File "/data/riotbuild/dist/tools/suit_v4/gen_manifest.py", line 87, in <module>
    main()
  File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 696, in main
    _verify_python3_env()
  File "/usr/local/lib/python3.6/dist-packages/click/_unicodefun.py", line 124, in _verify_python3_env
    ' mitigation steps.' + extra
RuntimeError: Click will abort further execution because Python 3 was configured to use ASCII as encoding for the environment. Consult https://click.palletsprojects.com/en/7.x/python3/ for mitigation steps.

This system supports the C.UTF-8 locale which is recommended.
You might be able to resolve your issue by exporting the
following environment variables:

    export LC_ALL=C.UTF-8
    export LANG=C.UTF-8
/data/riotbuild/makefiles/suit.v4.inc.mk:64: recipe for target '/data/riotbuild/examples/suit_update/bin/samr21-xpro/suit_update-riot.suitv4.1562671759.bin' failed
make: *** [/data/riotbuild/examples/suit_update/bin/samr21-xpro/suit_update-riot.suitv4.1562671759.bin] Error 1

Doing as suggested fixed the issue.

[fjmolinas]

Re-based on #75 it now succeeds. So lets wait for #75.

[emmanuelsearch]

@fjmolinas is this an ACK ;)
(now that #75 is merged)

[kaspar030]

Doing as suggested fixed the issue.

This has been resolved.

[fjmolinas]

Since click was removed from RIOT-OS/RIOT#11818 (comment) lets remove it.

[fjmolinas]

This click can be removed.

[emmanuelsearch]

@kaspar030 seems like an easy fix ;)
so let's merge this PR the last one preliminary to #11818 ?

[kaspar030]

done

[fjmolinas]

ACK, GO.

[fjmolinas]

GO!