cros-credentials.eclass: add some debug details

BUG=chromium:1025578
TEST=emerging dumps some helpful info about available creds

Change-Id: I1c4bc27c765a92174ae69bff5046c8562f1ec9b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/1961094
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Mike Nichols <mikenichols@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2340421
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed