Ensure bo is set should we panic in VBO_DerefBusyObj
Export the VRT runtime version.

The vmod packages need this to know if they are
installable or not for this Varnish version.
Rework example

Fixes #1636
Extract gitref using same method as debs.
Reduce fetch_chunksize to 16k as agreed on VDD14Q4.
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Update examples
bump the varnishtest CLI timeout from 20 to 30 seconds

This avoids false negatives with slow name resolutions
White space OCD.
Remove trailing white space.
Typo