gnu: python: Clarify and shorten the list of built-time modules.

* gnu/packages/python.scm (python-2)[arguments]: Make the #:modules list
  shorter.

gnu: python: Do not record configure flags.

This reduces the number of run-time dependencies of python-2 from 25 to
15, corresponding only to ~4 MiB.

* gnu/packages/python.scm (python-2)[arguments]: Add
  'do-not-record-configure-flags' phase.

gnu: python: Factorize configure flags with minimal variants.

* gnu/packages/python.scm (python2-minimal, python-minimal)[arguments]:
  Reuse the inherited configure flags, and just add
  --without-system-ffi.

gnu: python: Make 'sys.version' deterministic.

* gnu/packages/patches/python-2-deterministic-build-info.patch,
  gnu/packages/patches/python-3-deterministic-build-info.patch: New
  files.
* gnu/packages/python.scm (python-2, python): Use them.
* gnu-system.am (dist_patch_DATA): Add them.

gnu: python: Set SOURCE_DATE_EPOCH to 1 instead of 0.

* gnu/packages/python.scm (python-2)[arguments]: Set SOURCE_DATE_EPOCH
  to 1 to match what the daemon does.
* guix/build/python-build-system.scm (set-SOURCE-DATE-EPOCH): Likewise.

gnu: python-2: Honor 'SOURCE_DATE_EPOCH'.

* gnu/packages/patches/python-2.7-source-date-epoch.patch: New file.
* gnu/packages/python.scm (python-2)[source]: Use it.
  [arguments]: Set SOURCE_DATE_EPOCH in 'patch-lib-shells' phase.
* guix/build/python-build-system.scm (set-SOURCE-DATE-EPOCH): New
  procedure.
  (%standard-phases): Add it.
* gnu-system.am (dist_patch_DATA): Add patch.

gnu: python-pickleshare: Add python-setuptools to native-inputs.

* gnu/packages/python.scm (python-pickleshare)[native-inputs]: Add
python-setuptools.

gnu: python-pathpy: Add python-setuptools to native-inputs.

* gnu/packages/python.scm (python-pathpy)[native-inputs]: Add
python-setuptools.

gnu: python2-oauthlib: Override python2-cryptography in inputs.

* gnu/packages/python.scm (python2-oauthlib)[inputs]: Override inherited
"python2-cryptography" in inputs.

gnu: python-oauthlib: Update to 1.0.3.

* gnu/packages/python.scm (python-oauthlib): Update to 1.0.3.
[native-inputs]: Move python-setuptools, python-nose, python mock here.
Add python-coverage.
[inputs]: Add python-blinker, python-cryptography, python-pyjwt.

gnu: python2-unittest2: Use python2-setuptools.

* gnu/packages/python.scm (python2-unittest2)[inputs]: Switch from
python-setuptools to python2-setuptools.

gnu: python-pyjwt: Update to 1.4.0.

* gnu/packages/python.scm (python-pyjwt): Update to 1.4.0.
[native-inputs]: Move python-setuptools here, add python-pytest-runner.

gnu: python-pytest-runner: Add python-setuptools as native-input.

* gnu/packages/python.scm (python-pytest-runner)[native-input]: Add
  python-setuptools.

gnu: python-setuptools-scm: Update to 1.9.0.

* gnu/packages/python.scm (python-setuptools-scm): Update to 1.9.0.
[native-inputs]: Add python-setuptools.

gnu: python-tornado: Use the preferred home-page.

* gnu/packages/python.scm (python-tornado)[home-page]: Use the preferred
  one.

gnu: python-cryptography: Update to 1.0.2.

* gnu/packages/python.scm (python-cryptography): Update to 1.0.2.

gnu: python-cryptography-vectors: Update to 1.0.2.

* gnu/packages/python.scm (python-cryptography-vectors): Update to 1.0.2.

gnu: Add python-pystache.

* gnu/packages/python.scm (python-pystache, python2-pystache): New
  variables.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: paramiko: Move python-pycrypto to the propagated inputs.

* gnu/packages/python.scm (python-paramiko): Move python-pycrypto to the
  propagated-inputs.

gnu: Add python-flake8-2.2.4

* gnu/packages/python.scm (python-flake8-2.2.4,
  python2-flake8-2.2.4): New variables.