Fix the memcache location value in horizon local settings
Fix the memcache location value in horizon local settings

When setting multi memcached servers, the value should be a list
rather then a comma joined string

This patch set I586ce1c6c3300254c4e2a398ff46645df576aeb0 set it in
wrong

TrivialFix

Change-Id: Ic612658ab0310c6764310bbca92c925da6d47f6c

mrangana/kolla,openstack/kolla,stackforge/kolla,coolsvap/kolla,coolsvap/kolla,nihilifer/kolla,intel-onp/kolla,mandre/kolla,openstack/kolla,intel-onp/kolla,rahulunair/kolla,coolsvap/kolla,mandre/kolla,stackforge/kolla,GalenMa/kolla,dardelean/kolla-ansible,dardelean/kolla-ansible,stackforge/kolla,rahulunair/kolla,mrangana/kolla,mandre/kolla,nihilifer/kolla,dardelean/kolla-ansible,GalenMa/kolla