Sync processutils from oslo-incubator

This includes the following changes:

  af41592 Catch OSError in processutils
  f773ea2 Fix i18n problem in processutils module
  8b2b0b7 Use hacking import_exceptions for gettextutils._
  3b71f46 Fixed misspellings of common words
  12bcdb7 Remove vim header
  a4dab73 Correct execute() to check 0 in check_exit_code

Closes-bug: #1271331
Change-Id: I12b621fa5a2cdeeab6d51902416ce5dd4db61ba7
Merge "Sync processutils from oslo-incubator"