* Move client DB opening logic to CLI
* Move restoration db open logic to CLI
This adds KeyValueDBHandler which handles opening a new database, thus allow us to move the restoration db open logic
out of ethcore.
* Move rocksdb's compactionprofile conversion to CLI
* Move kvdb_rocksdb as test dependency for ethcore
* Fix tests due to interface change
* Fix service tests
* Remove unused migration dep for ethcore
* separate migration from util and make its dependencies into libs:
* snappy
* kvdb
* error
* common
* renamed common -> macros
* util error does not depend on snappy module
* ethsync does not depend on util nor ethcore_error
* nibbleslice and nibblevec merged with patricia_trie crate
* removed unused dependencies from util
* util journaldb traits does not need to be public
* util_error
* fixed ethcore compile error
* ignore .swo files
* Update chain.rs
