bump(sys-apps/systemd): sync with upstream

Packages updated:
  sys-apps/gentoo-systemd-integration
  sys-apps/hwids
  sys-apps/kmod
  sys-apps/systemd
  sys-apps/systemd-sysv-utils
  virtual/udev
bump(eclass): sync with upstream
revert(vim.eclass): Roll this back to the previous version.

The new vim eclass is adding gawk as a dependency but we currently block
that in favor of mawk on target hosts. Not worth investigating further
right now so stick with the older version until a solution is chosen.
bump(virtual/python-argparse): sync with upstream
bump(dev-python/python-exec): sync with upstream
Merge pull request #50 from marineam/systemd

Systemd and eclass updates