all.sh: Generate seedfile for crypto submodule tests

When running tests from the crypto submodule, generate and use a
seedfile within the crypto/tests directory.

tests/scripts/all.sh

@@ -406,6 +406,9 @@ pre_check_seedfile () {
     if [ ! -f "./tests/seedfile" ]; then
         dd if=/dev/urandom of=./tests/seedfile bs=32 count=1
     fi
+    if [ ! -f "./crypto/tests/seedfile" ]; then
+        dd if=/dev/urandom of=./crypto/tests/seedfile bs=32 count=1
+    fi
 }
 
 pre_setup_keep_going () {