Red Hat OpenStack 7 channels are not listed in available channels

Issue

We try to enable the OSP7 related channels, but the system can only see the OSP5 and OSP6 channels:

# subscription-manager list

+-------------------------------------------+
    Installed Product Status
+-------------------------------------------+
Product Name:   Red Hat Enterprise Linux Server
Product ID:     69
Version:        7.1
Arch:           x86_64
Status:         Subscribed
Status Details: 
Starts:         10/10/2014
Ends:           10/10/2015

Product Name:   Red Hat OpenStack
Product ID:     191
Version:        5.0
Arch:           x86_64
Status:         Subscribed
Status Details: 
Starts:         10/10/2014
Ends:           10/10/2015

Product Name:   Red Hat OpenStack Beta
Product ID:     220
Version:        Beta
Arch:           x86_64
Status:         Subscribed
Status Details: 
Starts:         10/10/2014
Ends:           10/10/2015

# yum repolist all | grep open
rhel-7-server-openstack-5.0-debug-rpms/7Server/x86_64                disabled
rhel-7-server-openstack-5.0-rpms/7Server/x86_64                      disabled
rhel-7-server-openstack-5.0-source-rpms/7Server/x86_64               disabled
rhel-7-server-openstack-6.0-debug-rpms/7Server/x86_64                disabled
rhel-7-server-openstack-6.0-installer-debug-rpms/7Server/x86_64      disabled
rhel-7-server-openstack-6.0-installer-rpms/7Server/x86_64            disabled
rhel-7-server-openstack-6.0-installer-source-rpms/7Server/x86_64     disabled
rhel-7-server-openstack-6.0-rpms/7Server/x86_64                      disabled
rhel-7-server-openstack-6.0-source-rpms/7Server/x86_64               disabled
rhel-7-server-openstack-beta-debug-rpms/x86_64                       disabled
rhel-7-server-openstack-beta-rpms/x86_64                             disabled
rhel-7-server-openstack-beta-source-rpms/x86_64                      disabled