Merge branch 'tests-logger' of https://github.com/rudimeier/util-linux

* 'tests-logger' of https://github.com/rudimeier/util-linux:
  travis: install socat >= 1.7.2
  tests: add subtests for invalid logger devive
  tests: logger/errors does not use --no-act
  tests: logger, validate written socket data
  tests: logger with socat device
  tests: simplify common logger options
  logger: --stderr and --no-act turn "auto-errors" on

diff --cc tests/functions.sh
Simple merge