Use quay.io in mariadb-centos imagestream for RHEL7
Use quay.io in mariadb-centos imagestream for RHEL7

Signed-off-by: Petr "Stone" Hracek <5ec98b824b3d06300936ce230b04e9851e98fc96@redhat.com>

sclorg/mariadb-container,sclorg/mariadb-container