TracGit: Replace usage of Python 2.6 `subprocess.Popen.terminate()`.
TracGit: Replace usage of Python 2.6 `subprocess.Popen.terminate()`.

Resolves #10607.

git-svn-id: f68c6b3b1dcd5d00a2560c384475aaef3bc99487@11000 af82e41b-90c4-0310-8c96-b1721e28e2e2

exocad/exotrac,exocad/exotrac,exocad/exotrac,exocad/exotrac