When something goes wrong, many users will happily provide output using
GIT_TRACE and GIT_CURL_VERBOSE. This is very useful for Git, but Git
LFS doesn't honor the latter (since we don't use libcurl). Instead, we
require users to set GIT_TRANSFER_TRACE. This makes for a prolonged and
more difficult debugging experience.
Despite the fact that we don't use libcurl, honor the GIT_CURL_VERBOSE
flag and act as if the user had set GIT_TRANSFER_TRACE instead. This
honors the intent of what the user wanted (transfer-related debugging
information) and makes debugging easier for end users and maintainers
alike.
aba74c1fda