Fix a crash on handling distorted server version (like "VERSION 1.4.14 (Ubuntu)")

When I tried to connect to memcached server on my Ubuntu 14.04 the mcd crashed. This happens because the memcached server returns distorted server version string - "VERSION 1.4.14 (Ubuntu)". The mcd doesn't expect any other tokens after a version number, so it crashes.
I propose to ignore such tokens.