Avoid making long result file names by replacing env name by hash if long #675
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The result file name lengths should be limited to some reasonable size,
as there can in principle be arbitrary many dependencies. Replace the
environment name by its hash if it's longer than 128 characters.
The rest of asv code does not assume result files are named in a particular
way, just that the mapping is deterministic and unique (which even MD5 hashes
satisfy for non-attack inputs).
Fixes gh-621