The current logic to create checkout layers doesn't work in all cases.
For example, let's assume there are three projects: "foo", "foo/bar" and
"foo-bar". Sorting lexicographical order is incorrect as foo-bar would
be placed between foo and foo/bar, breaking layering logic.
Instead, we split filepaths based using path delimiter (always /) and
then use lexicographical sort.
BUG=b:325119758
TEST=./run_tests, manual sync on chromiumos repository
Change-Id: I76924c3cc6ba2bb860d7a3e48406a6bba8f58c10
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/412338
Tested-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: George Engelbrecht <engeg@google.com>
46790229fc