cubicweb-vcsfile #3027232 15s sleep in HGRepository.pull_or_clone_cache is expensive [validation pending]

In particular in tests.

A better solution to https://www.cubicweb.org/ticket/2818315 should be found.

prioritynormal
typebug
done in1.13.3
load left0.000
closed by#67e38d51fa55 Don't sleep during tests (closes #3027232)
patchDon't sleep during tests (closes #3027232) [applied]