Allow configuring osiris data_dir in Cuttlefish config

This is the same as the `raft.data_dir` option but for Osiris' data
directory. Configuring this in Cuttlefish is nicer than the existing
`$RABBITMQ_STREAM_DIR` environment variable way of changing the dir.

(cherry picked from commit c81fbc5)

# Conflicts:
#	deps/rabbit/priv/schema/rabbit.schema
#	deps/rabbit/test/config_schema_SUITE_data/rabbit.snippets

Author: the-mikedavis

deps/rabbit/priv/schema/rabbit.schema

@@ -2799,8 +2799,24 @@ fun(Conf) ->
     end
 end}.
 
+<<<<<<< HEAD
 %% See github.com/rabbitmq/osiris#192 and https://github.com/rabbitmq/rabbitmq-server/commit/9f162dfd01c1516d168e7d1fad39d33a929756e5
 %% Enables read-head
+=======
+{mapping, "stream.data_dir", "osiris.data_dir", [
+  {datatype, string}
+]}.
+
+{translation, "osiris.data_dir",
+    fun(Conf) ->
+        case cuttlefish:conf_get("stream.data_dir", Conf, undefined) of
+            undefined -> cuttlefish:unset();
+            Val       -> Val
+        end
+    end
+}.
+
+>>>>>>> c81fbc5dc (Allow configuring osiris data_dir in Cuttlefish config)
 {mapping, "stream.read_ahead", "rabbit.stream_read_ahead",
     [{datatype, [{enum, [true, false]}, integer, string]}]}.
 

deps/rabbit/test/config_schema_SUITE_data/rabbit.snippets

@@ -1278,6 +1278,7 @@ credential_validator.regexp = ^abc\\d+",
       {stream_read_ahead, false}
      ]}],
    []},
+<<<<<<< HEAD
   {stream_read_ahead_limit_bytes,
    "
     stream.read_ahead = 8192
@@ -1292,6 +1293,16 @@ credential_validator.regexp = ^abc\\d+",
    ",
    [{rabbit, [
       {stream_read_ahead, "8KiB"}
+=======
+
+  %%
+  %% Stream data dir
+  %%
+  {stream_data_dir,
+   "stream.data_dir = /data/rabbitmq/stream",
+   [{osiris, [
+      {data_dir, "/data/rabbitmq/stream"}
+>>>>>>> c81fbc5dc (Allow configuring osiris data_dir in Cuttlefish config)
      ]}],
    []}
 ].