Merge branch 'en/fast-import-verify-path'

"git fast-import" learned to reject paths with ".."  and "." as
their components to avoid creating invalid tree objects.

* en/fast-import-verify-path:
  t9300: test verification of renamed paths
  fast-import: disallow more path components
  fast-import: disallow "." and ".." path components

diff --cc builtin/fast-import.c
Simple merge

diff --cc t/t9300-fast-import.sh
Simple merge

diff --cc t/t9350-fast-export.sh
Simple merge