Update to probert tip

The minimum required: it still only looks at the "blockdev" key in the
probe data, none of the exciting new stuff.

requirements.txt

@@ -11,4 +11,4 @@ jsonschema
 pyudev
 requests
 requests-unixsocket
--e git+https://github.com/CanonicalLtd/probert@670c7258014eef13a971be0bf12206d96f2829f3#egg=probert
+-e git+https://github.com/CanonicalLtd/probert@31e973d130a137ef1713ac23a422af0e32108c01#egg=probert

snapcraft.yaml

@@ -98,5 +98,5 @@ parts:
     stage-packages: [libc6, libnl-3-dev, libnl-genl-3-dev, libnl-route-3-dev]
     source: https://github.com/CanonicalLtd/probert.git
     source-type: git
-    source-commit: d4276ab044f4cc8311fb66a9050f6674726cbbf2
+    source-commit: 31e973d130a137ef1713ac23a422af0e32108c01
     requirements: requirements.txt

subiquity/models/filesystem.py

@@ -913,7 +913,7 @@ class FilesystemModel(object):
         return mounted_disks
 
     def probe(self):
-        storage = self.prober.get_storage()
+        storage = self.prober.get_storage()["blockdev"]
         currently_mounted = self._get_system_mounted_disks()
         for path, data in storage.items():
             log.debug("fs probe %s", path)

subiquitycore/prober.py

@@ -74,4 +74,5 @@ class Prober():
 
     def get_storage_info(self, device):
         ''' Load a StorageInfo class for specified device '''
-        return StorageInfo({device: self.get_storage().get(device)})
+        return StorageInfo(
+            {device: self.get_storage()['blockdev'].get(device)})