catacomb-import-update: Rename from import-catacomb-crypto

We are going to make an output directory for it, which will be called
catacomb-import.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/import-catacomb-crypto b/catacomb-import-update
similarity index 100%
rename from import-catacomb-crypto
rename to catacomb-import-update