repo: show redirects when tracing commands
repo: show redirects when tracing commands

This copies the output style we use in git_command for showing output
and input redirections.

Change-Id: I449b27e7b262e1b30b24333109a1d91d9c7b1ce7
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/256453
Reviewed-by: Jonathan Nieder <96e93edf89a1b75e35c5d08e01778cfc4fff73d9@google.com>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@google.com>

codetutil/git-repo,TheQtCompany/git-repo,aosp-mirror/tools_repo,codetutil/git-repo,couchbasedeps/git-repo,TheQtCompany/git-repo,mer-tools/git-repo,lipro-yocto/git-repo,couchbasedeps/git-repo,lewixliu/git-repo,mer-tools/git-repo,GerritCodeReview/git-repo,GerritCodeReview/git-repo,lipro-yocto/git-repo,aosp-mirror/tools_repo,lewixliu/git-repo