Merge branch 'jk/push-progress'

* jk/push-progress:
  push: pass --progress down to git-pack-objects
  t5523-push-upstream: test progress messages
  t5523-push-upstream: add function to ensure fresh upstream repo
  test_terminal: ensure redirections work reliably
  test_terminal: catch use without TTY prerequisite
  test-lib: allow test code to check the list of declared prerequisites
  tests: test terminal output to both stdout and stderr
  tests: factor out terminal handling from t7006

diff --cc builtin/send-pack.c
Simple merge

diff --cc t/test-lib.sh
Simple merge

diff --cc t/test-terminal.perl
Simple merge