next: factor out the logic to update to changeset in another function This patch moves the logic to update to children changeset during `hg next` in a separate function because we want to re-use the logic when we will prompt user to choose a changeset in case of multiple childrens.

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# utility to setup pythonpath to point into the tested repository

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export SRCDIR=`dirname $TESTDIR`

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if [ -n "$PYTHONPATH" ]; then

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    export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH

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    export PYTHONPATH=$SRCDIR:$PYTHONPATH

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else

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    export PYTHONPATH=$SRCDIR

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fi