Valid helper makes "Connected to Q of R" irrelevant for upload success

[Faux]

When a machine has a valid helper configured and connected, the number of storage nodes it is directly connected to becomes far less interesting.

For example:

• Machine A is sitting on some awful network (and hence can't connect to nearly anything), but I've made sure it can access the helper (H).
• Machine H, the helper, can talk to most of the machines in the storage cluster.
• Machine A's status page reports "Connected to 1 of 9 storage nodes".
• Machine H's status page reports "Connected to 8 of 9 storage nodes".

From looking at A's status page, it's impossible(?) to know that uploads (at 3-7-10) will succeed.

It would be nice if this was clearer, perhaps by reporting the helper's status?

[daira]

Note that the helper isn't used in all cases, only for immutable uploads (#268, #283). I agree that it would be useful to show the helper's connected-server-count as well though.

We would probably need to add chk_upload_helper.connected_server_count to the helper's stats result​.