Description of problem:
Memcached is binding to 0.0.0.0 on tcp/udp by default.  This is not a correct configuration for memcache.

Version-Release number of selected component (if applicable):
Fedora 27, Centos 7.4
Was cited in: RH bug fixed back 2016 that appears to have not been adopted: https://bugzilla.redhat.com/show_bug.cgi?id=1182542
Corresponding bug opened for CentOS: https://bugs.centos.org/view.php?id=14537

How reproducible:
Easy

Steps to Reproduce:
1. Install CentOS or Fedora
2. Check netstat for memcache running bound to 0.0.0.0

Actual results:
tcp        0      0 0.0.0.0:11211           0.0.0.0:*               LISTEN      2447/memcached
udp        0      0 0.0.0.0:11211           0.0.0.0:*                           2447/memcached

Expected results:
tcp        0      0 127.0.0.1:11211           0.0.0.0:*               LISTEN      2447/memcached
udp        0      0 127.0.0.1:11211           0.0.0.0:*                           2447/memcached

Additional info:
This is being widely abused as a reflection attack by malicious actors.