multi_update.py update all VNDK snapshots at once.

multi_update.py runs the update.py for all branches at once.
It makes vndk snapshot update much easy.

Bug: 260021945
Test: development/vndk/snapshot/multi_update.py --all -vv
Change-Id: Iaeadf75c8e05f54bcda2c577aba58f483e99ca00
3 files changed