Prepare separate runtime for testing sub2sub bridge (#341)

* renamed bin/node/runtime to bin/node/rialto-runtime

* replaced bridge-node-runtime references with rialto-runtime references

* separate folders for millau/rialto nodes+runtimes

* extracted pallet-shift-session-manager

* bridge-node -> bridge-node-runtime

* uninstall previous rust (temp solution???)

* fix dockerfile

* cargo fmt

* fix benchmarks check

* fix benchmarks again

* update LAST_RUST_UPDATE to clear the cache

* changed runtime comments

* move bin/node/* to bin/

* REVERT ME

* Revert "REVERT ME"

This reverts commit 7c335f94.

* specify container name

* REVERT ME

* container_name -> hostname

* fix typo

* aliases

* Revert "REVERT ME"

This reverts commit 0e74af5f.

* removed prefixes