Adding a manifest to sapi application causes issues with sapi service

Steps to reproduce

Create a new manifest in sapi

sdc-sapi /manifests -X POST -d '{
  "name": "chd_test",
  "path": "/tmp/test",
  "template": "testing"
}'

Add the manifest to the sapi application, so it gets picked up by config-agent everywhere

sdc-sapi /applications/$(sdc-sapi /applications?name=sdc | json -H 0.uuid) -X PUT -d '
{
  "action":"update",
  "manifests":{
    "chd_test":"'$(sdc-sapi /manifests | json -H -c 'name=="chd_test"' 0.uuid)'"
  }
}'

Trigger a sapi sync to make it refresh the local cache

Expected result

sapi0 caches the manifest in local storage, along with the application change
config-agent pushes out the changes everywhere
sapi service can be restarted happily (& the hourly local storage refresh happens successfully)

Actual Result

sapi0 local storage doesn't contain the new manifest

[root@052ffb5b-353e-4de5-95d0-47c8509ca4ca (dc1:sapi0) ~]# ls -l /sapi/sapi_manifests/9c563244-7467-443d-a34b-67e59d49191f
ls: cannot access /sapi/sapi_manifests/9c563244-7467-443d-a34b-67e59d49191f: No such file or directory

sapi service hourly refresh causes a core dump, due to the manifest not being on disk

[2017-05-11T20:05:26.092Z]  INFO: sapi/16519 on 052ffb5b-353e-4de5-95d0-47c8509ca4ca: refreshing local stor from moray...
[2017-05-11T20:05:26.405Z]  WARN: sapi/16519 on 052ffb5b-353e-4de5-95d0-47c8509ca4ca: object 9c563244-7467-443d-a34b-67e59d49191f doesn't exist
Uncaught TypeError: Cannot read property 'value' of null

FROM
/opt/smartdc/sapi/lib/server/stor/moray_local.js:199:30
/opt/smartdc/sapi/lib/server/stor/moray_local.js:198:45
/opt/smartdc/sapi/node_modules/vasync/lib/vasync.js:84:5
/opt/smartdc/sapi/lib/server/stor/local.js:155:17
fs.js:266:14
Object.oncomplete (fs.js:107:15)

It looks from testing like creating a manifest through sdc-sapi on the headnode, that doesn't get written out to the local storage on sapi0 zone. This then has the knock-on effect of causing the local storage refresh (either hourly or at startup) to bail out, due to the manifest not being found in local storage.

TritonDataCenter / sdc-sapi