How to generate new bootstrap snapshot

1. Patch src/box/lua/upgrade
2. Run Tarantool at clean directory:

• box.cfg{}
• box.internal.bootstrap()

3. Edit the last *.snap file in binary mode: change value of ‘vclock’ to empty: {}. For editing use vim -b <snap_file_name>. Don't forget -b option!

4. mv *.snap src/box/bootstrap.snap
5. make -j