apycot #2039958 Detect and ignore duplicate clone requests in a test [rejected]

When a repository is asked to be clone twice (multiple dependencies), ignore subsequent clones

This could be done by considering the following error as a warning

`hg clone -q http://hg.logilab.org/cubes/awstats` returned with status : 255
output:
abandon : destination 'awstats' is not empty
priorityimportant
typebug
done in<not specified>
load0.000
load left0.000
closed by<not specified>