blackbox: defer opening a log file until needed (issue3869)
Previously, we opened the log file when creating a repo object. This
was inefficient (not all repo creation is going to result in a need to
log something), but more importantly it broke subrepo updates when used
on NFS.
* perform an update in the master repo that triggers a subrepo clone
* empty subrepo already exists, and has an open, empty blackbox.log file
due to it being opened eagerly/prematurely
* hg decides to blow away the skeletal subrepo (see use of shutil.rmtree
in subrepo._get)
* we crash, due to NFS treating a delete of an open file as really a
rename to a hidden ".nfs" file
Now that we open the blackbox log file on demand, no file exists at the
time the empty subrepo is deleted, so the above problem does not occur.
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