The connectivity check in 'git fetch' and 'git receive-pack' has
been optimized with an alternative incremental mode, available via
'transfer.connectivityCheck=incremental'. Instead of walking the
full object closure of the boundary commits, it compares the trees
of incoming commits against their trusted parent trees, skipping
unchanged subtrees.
* kk/connectivity-check-incremental:
connected: add incremental connectivity check via rev-list
connected: add transfer.connectivityCheck config and rev-list flag
p5413: add perf tests for connectivity check
Documentation: describe connectivity checking
