Merge branch 'mg/name-rev-tests-with-short-stack' into next

A handful of tests to demonstrates a recursive implementation of
"name-rev" hurts.

* mg/name-rev-tests-with-short-stack:
t6120: test describe and name-rev with deep repos
t6120: clean up state after breaking repo
t6120: test name-rev --all and --stdin
t7004: move limited stack prereq to test-lib

diff --cc t/test-lib.sh
Simple merge