When migrating a repository to use Git LFS for the first time, a user is
also required to run 'git lfs install' inside of their newly-migrated
repository, lest they are unable to push.
This is due to the fact that 'git lfs install' writes
.git/hooks/pre-push, which Git invokes, in turn invoking Git LFS to push
Git LFS objects to the remote before sending Git objects.
Without this, we will push only plain-text pointer files, which puts the
pusher at risk of loosing data, or failing any provider-specific
verification/integrity checks.
So, let's run installHooks() to place hooks in the right place, which
makes the following command sequence possible:
$ git lfs migrate import ...
$ git push --all
Let's avoid running this in 'git lfs migrate info' and 'git lfs migrate
export', since neither require it.
