Beta: 1.11.6 backports (#9015)

* parity-version: bump beta to 1.11.6

* scripts: remove md5 checksums (#8884)

* Add support for --chain tobalaba

* Convert indents to tabs :)

* Fixes for misbehavior reporting in AuthorityRound (#8998)

* aura: only report after checking for repeated skipped primaries

* aura: refactor duplicate code for getting epoch validator set

* aura: verify_external: report on validator set contract instance

* aura: use correct validator set epoch number when reporting

* aura: use epoch set when verifying blocks

* aura: report skipped primaries when generating seal

* aura: handle immediate transitions

* aura: don't report skipped steps from genesis to first block

* aura: fix reporting test

* aura: refactor duplicate code to handle immediate_transitions

* aura: let reporting fail on verify_block_basic

* aura: add comment about possible failure of reporting

* Only return error log for rustls (#9025)

* Transaction Pool improvements (#8470)

* Don't use ethereum_types in transaction pool.

* Hide internal insertion_id.

* Fix tests.

* Review grumbles.

* Improve should_replace on NonceAndGasPrice (#8980)

* Additional tests for NonceAndGasPrice::should_replace.

* Fix should_replace in the distinct sender case.

* Use natural priority ordering to simplify should_replace.

* Minimal effective gas price in the queue (#8934)

* Minimal effective gas price.

* Fix naming, add test

* Fix minimal entry score and add test.

* Fix worst_transaction.

* Remove effective gas price threshold.

* Don't leak gas_price decisions out of Scoring.

* Never drop local transactions from different senders. (#9002)

* Recently rejected cache for transaction queue (#9005)

* Store recently rejected transactions.

* Don't cache AlreadyImported rejections.

* Make the size of transaction verification queue dependent on pool size.

* Add a test for recently rejected.

* Fix logging for recently rejected.

* Make rejection cache smaller.

* obsolete test removed

* obsolete test removed

* Construct cache with_capacity.

* Optimize pending transactions filter (#9026)

* rpc: return unordered transactions in pending transactions filter

* ethcore: use LruCache for nonce cache

Only clear the nonce cache when a block is retracted

* Revert "ethcore: use LruCache for nonce cache"

This reverts commit b382c19abdb9985be1724c3b8cde83906da07d68.

* Use only cached nonces when computing pending hashes.

* Give filters their own locks, so that they don't block one another.

* Fix pending transaction count if not sealing.

* Clear cache only when block is enacted.

* Fix RPC tests.

* Address review comments.

* A last bunch of txqueue performance optimizations (#9024)

* Clear cache only when block is enacted.

* Add tracing for cull.

* Cull split.

* Cull after creating pending block.

* Add constant, remove sync::read tracing.

* Reset debug.

* Remove excessive tracing.

* Use struct for NonceCache.

* Fix build

* Remove warnings.

* Fix build again.

* miner: add missing macro use for trace_time

* ci: remove md5 merge leftovers