Replace debug key.

This gives better consistency with the release key. Also improve the
debug_sign script to use base64, to eliminate issues with escaping and
newlines.

Bug: 110509075
Test: atest CtsSignedConfigHostTestCases
Change-Id: Id8d7b6b5bee3340803d30d3a4a34c7e62f565a93
diff --git a/tools/signedconfig/debug_sign.sh b/tools/signedconfig/debug_sign.sh
index 28e5428..3a2814a 100755
--- a/tools/signedconfig/debug_sign.sh
+++ b/tools/signedconfig/debug_sign.sh
@@ -2,5 +2,5 @@
 # Script to sign data with the debug keys. Outputs base64 for embedding into
 # APK metadata.
 
-openssl dgst -sha256 -sign $(dirname $0)/debug_key.pem  $1 | base64 -w 0
+openssl dgst -sha256 -sign $(dirname $0)/debug_key.pem  <(echo -n "$1" | base64 -d) | base64 -w 0
 echo