Make git commands nosier.

[DDRBoxman]

Git commands have flags passed to them to make them more verbose and spit out progress. This should help us not pre-emptively think a process has died when it hasn't.

This might mitigate some issues in #832.

I still need to figure out how to get git-lfs to be noisier.

[sdboyer]

oh, this definitely seems like a good idea. i guess the weird thing is how long git clones have been surviving at ALL with our monitored system, without this kind of progress indicator :/

can you find out when those options were added, though? we don't have a hard rule on what our minimum git version is currently, but i've generally avoided relying on features that are >5 years old thus far.

[DDRBoxman]

git clone:

• verbose: 1.6.1 https://github.com/git/git/blob/master/Documentation/RelNotes/1.6.1.txt#L101
• progress: 1.7.0 git/git@5a518ad

git checkout:

• progress: 2.7.0 git/git@870ebdb

[sdboyer]

OK, let's keep the clone, but 1.5 years is a little too recent for checkout. (Fortunately, I'm more concerned about clone than checkout).

[sdboyer]

great, thank you, that'll do it!

happy first PR! 🎉