client/authority-discovery: Limit number of connections to authorities (#4487)

* client/authority-discovery: Limit number of connections to authorities

Instead of connecting to all sentry nodes of all authorities, with this
patch the authority discovery module does the following:

- Choose one sentry node per authority at random.

- Choose MAX_NUM_AUTHORITY_CONN out of the above at random.

The module uses randomness to prevent hot spots, e.g. all nodes trying
to connect to a single node. If the authority discovery module would
choose the nodes to connect to at random on each new address that it
learns of, the node would go through a lot of connection churn.  Instead
it creates a random seed at start up and uses this seed for its RNG on
each update cycle.

* client/authority-discovery: Extract address cache into own module

* client/authority-discovery/src/addr_cache: Add basic unit tests

* client/authority-discovery: Replace unwrap with expect on [u8] cmp

* .maintain/sentry-node/docker-compose.yml: Prefix endpoint flags

* client/authority-discovery/src/addr_cache: Use sort_unstable and cmp

* client/authority-discovery: Use BTreeMap in addr_cache for sorted iter

To reduce connection churn it is preferrable to have `get_subset` of the
`addr_cache` to return the same result on repeated calls. `get_subset`
iterates a map. To make the process of iteration deterministic, use a
`BTreeMap` instead of a `HashMap`.

substrate/client/authority-discovery/src/error.rs

@@ -22,6 +22,10 @@ pub type Result<T> = std::result::Result<T, Error>;
 /// Error type for the authority discovery module.
 #[derive(Debug, derive_more::Display, derive_more::From)]
 pub enum Error {
+	/// Received dht value found event with records with different keys.
+	ReceivingDhtValueFoundEventWithDifferentKeys,
+	/// Received dht value found event with no records.
+	ReceivingDhtValueFoundEventWithNoRecords,
 	/// Failed to verify a dht payload with the given signature.
 	VerifyingDhtPayload,
 	/// Failed to hash the authority id to be used as a dht key.