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hg-ssh: reject push earlier (on pretxnopen)

We now have a lock triggered for any transaction. We use it to ensure no-read
are made in read-only mode. We need more that just "no changegroup is added",
since bundle2 allows for more than just changegroup to be exchanged.  We still
protect pushkey as it may write data without opening a transaction.

Greg Ward, author of the original bfiles extension
Na'Tosha Bard of Unity Technologies
Fog Creek Software
Special thanks to the University of Toronto and the UCOSP program