[Beta] Backports (#8136)

* Support parity protocol. (#8035)

* updater: apply exponential backoff after download failure (#8059)

* updater: apply exponential backoff after download failure

* updater: reset backoff on new release

* Max code size on Kovan (#8067)

* Enable code size limit on kovan

* Fix formatting.

* Limit incoming connections.  (#8060)

* Limit ingress connections
* Optimized handshakes logging

* WASM libraries bump (#7970)

* update wasmi, parity-wasm, wasm-utils to latest version

* Update to new wasmi & error handling

* also utilize new stack limiter

* fix typo

* replace dependency url

* Cargo.lock update

* add some dos protection (#8084)

* revert removing blooms (#8066)

* Revert "fix traces, removed bloomchain crate, closes #7228, closes #7167"

This reverts commit 1bf62038678295e5586f02a38a0c5aab9a9efe62.

* Revert "fixed broken logs (#7934)"

This reverts commit f8a2e53f.

* fixed broken logs

* bring back old lock order

* remove migration v13

* revert CURRENT_VERSION to 12 in migration.rs

* more dos protection (#8104)

* Const time comparison (#8113)

* Use `subtle::slices_equal` for constant time comparison.

Also update the existing version of subtle in `ethcrypto` from
0.1 to 0.5

* Test specifically for InvalidPassword error.

* fix trace filter returning returning unrelated reward calls, closes #8070 (#8098)

* network: init discovery using healthy nodes (#8061)

* network: init discovery using healthy nodes

* network: fix style grumble

* network: fix typo

* Postpone Kovan hard fork (#8137)

* ethcore: postpone Kovan hard fork

* util: update version fork metadata

* Disable UI by default. (#8105)

* dapps: update parity-ui dependencies (#8160)