Chutney bootstrap-network script uses the wrong network flavour

The 'tools/bootstrap-network.sh' script doesn't actually use its program argument (the network flavour). This means that the incorrect network is started.

The line:

export CHUTNEY_NETWORK="$CHUTNEY_PATH/networks/$NETWORK_FLAVOUR"

should be:

export CHUTNEY_NETWORK="$CHUTNEY_PATH/networks/$flavour"

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