prototype new config format

cmd/sampleconf/pullbackup/backuphost.yml

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+prod1.example.com:
+
+  connect:
+    type: ssh
+    host: backuphost.example.com
+    user: root
+    port: 22
+    identity_file: /root/.ssh/id_ed25519
+
+  schedule:
+    # we cannot infer a schedule from steps below, thus define one here
+    type: cron
+    cron: "@every 10m" # see https://godoc.org/github.com/robfig/cron
+
+  steps:
+
+    # pull datasets from remote to local
+    - type: pull
+      mapping: {
+        "zroot<":"storage/backups/zrepl/prod1.example.com/zroot"
+        "zroot/tmp": "!"
+      }
+
+    # prune the snaphots we pulled
+    - type: prune
+      policy: grid
+      grid: 1x1h(keep=all) | 24x1h | 35x1d | 6x30d
+      dataset_filter: {
+        "storage/backups/zrepl/prod1.example.com/zroot<": ok
+      }
+      snapshot_filter: {
+        snapshot_prefix: zrepl_
+      }
+

cmd/sampleconf/pullbackup/productionhost.yml

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+backuphost.example.com:
+
+  global:
+    snapshot_prefix: zrepl_
+
+  # accept connections from backups.example.com via ssh / stdinserver command
+  serve:
+    auth: ssh
+    role: source
+    acl: {
+      "zroot<": ok,
+      "zroot/usr/home<": omit,
+    }
+
+  # periodic task list, following given schedule
+  schedule:
+    type: auto  # infer from autosnap step
+  steps:
+
+    - type: autosnap
+      interval: 10m
+      dataset_filter: {
+        "zroot<": ok
+      }
+
+    - type: prune
+      policy: grid
+      grid: 1x1h(keep=all)
+      dataset_filter: {
+        "zroot<": ok
+      }
+
+