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topic: fix compatibility issues caused because of change in transaction API

Raphaël Gomès requested to merge topic/default/default-compat into branch/default

In 36f08ae87ef687be53a59bd87376bcfbe4479205 in core mercurial, _validator attribute to transaction class was removed and a dict was introduced. It added a addvalidator() function to transaction class which can be used to register multiple validator callbacks.

This updates the code to use addvalidator() when _validator attribute is not present.

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