Restart memcached before starting seafile
Restart memcached before starting seafile

To fix issue https://github.com/SeafileDE/seafile-server-installer/issues/75
Fixes #75

haiwen/seafile-server-installer,shoeper/seafile-server-installer,seafile/seafile-server-installer,felag/seafile-server-installer,SeafileDE/seafile-server-installer,syncwerk/syncwerk-server-installer