Merge branch 'stable-2.1' into devel-2.1

* stable-2.1: (22 commits)
  Fix long-standing race condition bug in locking unittest
  confd client: copy the peers in UpdatePeerList
  testutils: Print name of test program before running it
  Don't use hardcoded name for pylint
  Partially revert "Makefile.am: Run pylint on all Python code"
  build-bash-completion: Take care of pylint warnings
  Makefile.am: Run pylint on all Python code
  Small improvements for release script
  check-python-code: Use “set -e” to abort on errors
  build-bash-completion: Fix a few pylint warnings
  Generate hmac file with a newline at the end
  jqueue: Don't return negative number for unchecked jobs when archiving
  cli.GenerateTable: Don't write EOL spaces
  Improve logging for workerpool tasks by providing __repr__
  workerpool: Simplify log messages
  workerpool: Use worker name as thread name
  workerpool: Make worker ID alphanumeric
  locking: Fix race condition in LockSet
  mcpu: Log lock status with sorted names
  locking: Append to list outside error handling block
  ...