tools/secretstore: add sync command, re-encrypt

This kills two birds with one stone:

 - update the secretstore tool to be slightly smarter about secrets, to
   the point where we can now just point it at a secret directory and
   ask it to 'sync' all secrets in there
 - runs the new fancy sync command on all keys to update them, which
   is a follow up to gerrit/328.

Change-Id: I0eec4a3e8afcd9481b0b248154983aac25657c40
diff --git a/hswaw/kube/secrets/cipher/prod-pretalx-s3.json b/hswaw/kube/secrets/cipher/prod-pretalx-s3.json
index 14b3728..9516d33 100644
--- a/hswaw/kube/secrets/cipher/prod-pretalx-s3.json
+++ b/hswaw/kube/secrets/cipher/prod-pretalx-s3.json
@@ -1,39 +1,50 @@
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