No password, otherwise building during 'atest' will fail waiting on a password

These files shouldn't need to change unless you want to generate new certificates to sign the APKs

Generated with:

development/tools/make_key cts-appsearch-helper-cert-a '/CN=cts-appsearch-helper-cert-a' development/tools/make_key cts-appsearch-helper-cert-b '/CN=cts-appsearch-helper-cert-b'