runtests: catch EPROTONOSUPPORT in checkportisavailable This is a follow-up of "runtests: check ports on IPv6 address". On some platforms, "socket.AF_INET6" exists while that does not necessarily mean the platform support IPv6 - when initializing a socket using "socket.socket", it could fail with EPROTONOSUPPORT. So treat that as "Port unavailable".

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  $ echo "[extensions]" >> $HGRCPATH

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  $ echo "mq=" >> $HGRCPATH

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  $ hg init

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  $ echo 'base' > base

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  $ hg ci -Ambase

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  adding base

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  $ hg qnew -mmqbase mqbase

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  $ hg qsave

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  $ hg qrestore 2

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  restoring status: hg patches saved state

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