cubicweb-mercurial-server #2801005 extract usefull utility from exec_in_hgadmin_repo [validation pending]

This could be made available to any repo.

prioritynormal
typeenhancement
done in0.2.1
load0.200
load left0.000
closed by#6e7132065d8c [entities] turn exec_in_hgadmin_clone into something more generic & useful (closes #2801005)
patch[entities] turn exec_in_hgadmin_clone into something more generic & useful (closes #2801005) [applied]