Prior to 5.0 the memcached admin_user was "_admin". In 5.0 it was changed to "@ns_server" and also other_users were added. But an upgraded doesn't change the admin_user.
On an upgrade admin_user should be changed. And other_users should be added.
|For Gerrit Dashboard: MB-37269|
|121225,5||MB-37269 Change memcached admin_user on upgrade||alice||ns_server||Status: MERGED||+2||+1|
|121299,1||Merge 'couchbase/alice' into mad-hatter||mad-hatter||ns_server||Status: ABANDONED||-2||0|
|121364,1||MB-37269 Change memcached admin_user on upgrade||mad-hatter||ns_server||Status: ABANDONED||-2||0|
|121368,2||Merge 'couchbase/alice' into mad-hatter||mad-hatter||ns_server||Status: MERGED||+2||+1|
|121376,1||Merge 'couchbase/mad-hatter' into master||master||ns_server||Status: MERGED||+2||+1|