Merge branch 'tc/http-cleanup'

* tc/http-cleanup: remote-curl: init walker only when needed remote-curl: use http_fetch_ref() instead of walker wrapper http: init and cleanup separately from http-walker http-walker: cleanup more thoroughly http-push: remove "|| 1" to enable verbose check t554[01]-http-push: refactor, add non-ff tests t5541-http-push: check that ref is unchanged for non-ff test