* maint:
Git 2.14.2
Git 2.13.6
Git 2.12.5
Git 2.11.4
Git 2.10.5
cvsimport: shell-quote variable used in backticks
archimport: use safe_pipe_capture for user input
shell: drop git-cvsserver support by default
cvsserver: use safe_pipe_capture for `constant commands` as well
cvsserver: use safe_pipe_capture instead of backticks
cvsserver: move safe_pipe_capture() to the main package