Support multiple memcached servers by adding `/etc/memcached_default.conf`.
Support multiple memcached servers by adding `/etc/memcached_default.conf`.

This allows to add additional memcached configs which will automatically be started by the default memcached service.

Fixes #1327.

clreed87/VVV,saucal/VVV,WybrenKoelmans/VVV,saucal/VVV,tomjn/varying-vagrant-vagrants,trepmal/varying-vagrant-vagrants,Varying-Vagrant-Vagrants/VVV,clreed87/VVV,DrewAPicture/varying-vagrant-vagrants,speartail/VVV,saucal/VVV,speartail/VVV,trepmal/varying-vagrant-vagrants,tomjn/varying-vagrant-vagrants,Varying-Vagrant-Vagrants/VVV,Varying-Vagrant-Vagrants/VVV,WybrenKoelmans/VVV,DrewAPicture/varying-vagrant-vagrants