Update registration.cpp
Merge pull request #117 from snowfed/master

Fixed a minor drawback in command_handler_throw in module backend
recovery: removed statement that have no effect
recovery: do not automatically cache node and session
eblob: do not call blocking function under mutex
recovery: fixed log message
recovery: more useful statistics
recovery: do not use __wrapped__ method of lru_cached objects
recovery: do not propagate elliptics exceptions from subprocess