Xu Cheng a25fc67813 update-test: use git clone --local instead of copy
The .git directory in BrewTestBot is huge(1GB) which results to poor
performance of `brew update-test`. Therefore, let's use `git clone
--local` here which will create hard symlink to boost performance.

Closes Homebrew/homebrew#44005.

Signed-off-by: Xu Cheng <xucheng@me.com>
2015-09-18 14:24:54 +08:00
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