doc: Populate the 'user' section

Per the spec [1]:

  user/ – end-user content such as concept guides, advice, tutorials,
  step-by-step instructions for using the CLI to perform specific tasks,
  etc.

The remaining content all ends up in here.

[1] specs.openstack.org/openstack/docs-specs/specs/pike/os-manuals-migration

Change-Id: I480eee9cd7568efe2f76dd185004774588eb4a99

doc/source/user/feature-matrix-hpc.ini

@@ -0,0 +1,51 @@
+[target.libvirt-kvm]
+title=libvirt+kvm (x86 & ppc64)
+link=http://docs.openstack.org/infra/manual/developers.html#project-gating
+
+[target.libvirt-kvm-s390]
+title=libvirt+kvm (s390x)
+link=http://docs.openstack.org/infra/manual/developers.html#project-gating
+
+[target.libvirt-virtuozzo-ct]
+title=libvirt+virtuozzo CT
+link=https://wiki.openstack.org/wiki/ThirdPartySystems/Virtuozzo_CI
+
+[target.libvirt-virtuozzo-vm]
+title=libvirt+virtuozzo VM
+link=https://wiki.openstack.org/wiki/ThirdPartySystems/Virtuozzo_Storage_CI
+
+[target.libvirt-xen]
+title=libvirt+xen
+link=https://wiki.openstack.org/wiki/ThirdPartySystems/XenProject_CI
+
+[target.xenserver]
+title=XenServer CI
+link=https://wiki.openstack.org/wiki/XenServer/XenServer_CI
+
+[target.vmware]
+title=VMware CI
+link=https://wiki.openstack.org/wiki/NovaVMware/Minesweeper
+
+[target.hyperv]
+title=Hyper-V CI
+link=https://wiki.openstack.org/wiki/ThirdPartySystems/Hyper-V_CI
+
+
+[operation.gpu-passthrough]
+title=GPU Passthrough
+notes=TODO add notes for feature
+maturity=experimental
+api_doc_link=http://developer.openstack.org/api-ref-compute-v2.1.html#createServer
+admin_doc_link=http://docs.openstack.org/admin-guide-cloud/compute-images-instances.html#instance-building-blocks
+tempest_test_uuids=9a438d88-10c6-4bcd-8b5b-5b6e25e1346f;585e934c-448e-43c4-acbf-d06a9b899997
+libvirt-kvm=complete:l
+libvirt-kvm-s390=unknown
+libvirt-virtuozzo-ct=partial
+driver-notes-libvirt-virtuozzo-ct=This is not tested in a CI system, but it is implemented.
+libvirt-virtuozzo-vm=partial
+driver-notes-libvirt-virtuozzo-vm=This is not tested in a CI system, but it is implemented.
+libvirt-xen=missing
+xenserver=partial:k
+vmware=missing
+hyperv=missing
+ironic=unknown