Set default memcached memory limit to 64MB.
Set default memcached memory limit to 64MB.

This commit sets the default attribute for memcached's
memory limit back to Ubuntu's packaging defaults (64MB).

Signed-off-by: Tyler Stachecki <ac19b26ca570cbd1d833044669caf79cb1d18c48@bloomberg.net>

bloomberg/chef-bcpc,bloomberg/chef-bcpc,bloomberg/chef-bcpc,bloomberg/chef-bcpc