* Implement rebond: allowing to re-bond stake unbonded.

* Update `per_thing` docs

* Update primitives/arithmetic/src/per_things.rs

Co-Authored-By: Bastian Köcher <[email protected]>

* Update per_things.rs

Co-authored-by: Bastian Köcher <[email protected]>

Related to #4456 

* Squash

* Fix keystore on wasm

* Update utils/browser/Cargo.toml

Co-Authored-By: Benjamin Kampmann <[email protected]>

* export console functions

* Use an Option<PathBuf> in keystore instead of cfg flags

* Add a KeystoreConfig

* Update libp2p

* Bump kvdb-web version

* Fix cli

* Upgrade versions

* Update wasm-bindgen stuff

Co-authored-by: Benjamin Kampmann <[email protected]>

Max Inden authored Jan 07, 2020 and asynchronous rob committed Jan 07, 2020

`GossipEngine::abort` and thus `ConsensusGossip::abort` are never
called. This patch removes both.

* do not chill indirectly-slashed nominators

* test nomination non-kick and vote ignoring behavior

* client: add a block blacklist extension

* test-utils: fix client construction

* client: fix rustdoc test

* client: allow reverting blocks past finality

* client: fix leaves reversion

* client: extend docs on revert

* client: add comment on leaves revert

Good night sweet prince

Previously one would create a sender and receiver channel pair, pass the
sender to the `build_network_future` through the service builder and
funnel network events returned from polling the network service into the
sender to be consumed by the authority discovery module owning the
receiver.

With recent changes it is now possible to register an `event_stream`
with the network service directly, thus one does not need to make the
detour through the `build_network_future`.

* 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/...

* triggers srml-contracts-waterfall ci

* only nightly and merges

* substrate does not use tager cache so far