Update Circle CI environment

[bridadan]

This should fix the build error affecting all Python 2 builds in CI.

Edit: I should have included more details about why we have to update setuptools. When running pip install -r mbed-os/requirements.txt on the CI machine, I received this error:

  Source in /tmp/pip-build-1a03jN/pyocd has version 0.14.3, which satisfies requirement pyocd>=0.14.0 from https://fil
es.pythonhosted.org/packages/6c/ae/0baea35a5d061315af00b4b461efa9f1f0c897017230442939f18e9e6885/pyocd-0.14.3.tar.gz#sh
a256=32d346c21a33d854e7294616927a2462cf5d98f9953f964d8b577dc42624cbcc (from mbed-host-tests<=1.5,>=1.1.2->-r mbed-os/r
equirements.txt (line 12))
Cleaning up...
  Removing source in /tmp/pip-Yom1Nt-build
  Removing source in /tmp/pip-build-1a03jN/prettytable
  Removing source in /tmp/pip-build-1a03jN/junit-xml
  Removing source in /tmp/pip-build-1a03jN/pyYAML
  Removing source in /tmp/pip-build-1a03jN/intervaltree
  Removing source in /tmp/pip-build-1a03jN/mbed-ls
  Removing source in /tmp/pip-build-1a03jN/mbed-host-tests
  Removing source in /tmp/pip-build-1a03jN/mbed-greentea
  Removing source in /tmp/pip-build-1a03jN/pyelftools
  Removing source in /tmp/pip-build-1a03jN/future
  Removing source in /tmp/pip-build-1a03jN/asn1ate
Exception:
Traceback (most recent call last):
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/basecommand.py", line 209, in main
    status = self.run(options, args)
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/commands/install.py", line 299, in run
    requirement_set.prepare_files(finder)
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/req/req_set.py", line 360, in prepare_fil
es
    ignore_dependencies=self.ignore_dependencies))
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/req/req_set.py", line 647, in _prepare_fi
le
    set(req_to_install.extras) - set(dist.extras)
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line
2810, in extras
    return [dep for dep in self._dep_map if dep]
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line
2624, in _dep_map
    dm.setdefault(extra,[]).extend(parse_requirements(reqs))
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line
2980, in parse_requirements
    "version spec")
  File "/opt/circleci/.pyenv/versions/2.7.12/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line
2945, in scan_list
    raise RequirementParseError(msg, line, "at", line[p:])
RequirementParseError: Expected version spec in enum34;python_version<"3.4" at ;python_version<"3.4"

There is a requirement parsing error with one of the packages. The syntax is valid, but the support was added in a later version of setuptools. The CI machine was running an old version of setuptools (20.10.1 to be exact, the latest release is 40.6.3 as of this writing), so I've added a command to update the package.

[screamerbg]

LGTM

[bridadan]

The old version of mercurial on the CI machine was having trouble with the redirect from developer.mbed.org to os.mbed.com:

$ mbed import https://developer.mbed.org/teams/Morpheus/code/mbed-Client-Morpheus-hg hg-test -v
[mbed] Working path "/home/circleci/project/.tests" (program)
[mbed] Importing program "hg-test" from "https://developer.mbed.org/teams/Morpheus/code/mbed-Client-Morpheus-hg" at latest revision in the current branch
[mbed] Trying to guess source control management tool. Supported SCMs: bld, git, hg
[mbed] Exec "git clone https://developer.mbed.org/teams/Morpheus/code/mbed-Client-Morpheus-hg /home/circleci/project/.tests/hg-test" in "/home/circleci/project/.tests"
Cloning into '/home/circleci/project/.tests/hg-test'...
fatal: unable to update url base from redirection:
  asked for: https://developer.mbed.org/teams/Morpheus/code/mbed-Client-Morpheus-hg/info/refs?service=git-upload-pack
   redirect: https://os.mbed.com/teams/Morpheus/code/mbed-Client-Morpheus-hg/info/refs/?service=git-upload-pack
[mbed] Exec "hg clone https://developer.mbed.org/teams/Morpheus/code/mbed-Client-Morpheus-hg /home/circleci/project/.tests/hg-test" in "/home/circleci/project/.tests"
abort: error: _ssl.c:510: error:14094438:SSL routines:SSL3_READ_BYTES:tlsv1 alert internal error
[mbed] ERROR: Unable to clone repository (https://developer.mbed.org/teams/Morpheus/code/mbed-Client-Morpheus-hg)

I've updated the URLs to use os.mbed.com instead.

[bridadan]

Ug, still not working. I'll try more tomorrow.

[bridadan]

Lol just stayed a little longer and got it working.

There were quite a few things that needed love in the Circle CI config. It's now using a more up to date OS (Debian Stretch), which fixes another issue I ran into with mercurial.

It also tests Python 3.6 since we say we support it in the README.

[theotherjimmy]

@bridadan Did you change the name of the checks that are required?

[bridadan]

@theotherjimmy looks like I did change the names of the jobs in Circle CI (to disambiguate Python 3.6 from Python 3.7). I can change the required checks on the repository if you're ok with these changes. (the existing PRs will probably need a rebase)