Bump VM minimum requirments to 3G

Increase the amount of memory required for VMs in a virtual tripleo
environment to 3G. We had been getting a lot of failures in CI on the
ubuntu overcloud jobs, various services were running out of memory.

The CI testenvs have already be rebuilt host 3G VMs.

Change-Id: Ia0fd8e3f86f5ca786356a460c91f33cfaf29c528
Switch to new setup-neutron

Switch to the new setup-neutron provided by os-cloud-config, and to
ease developer (and git) confusion, remove and ignore the old
setup-neutron script.

Change-Id: Iec4cad877f3583bd37222fa87c25a1503e7ba516
Support passing x86_64 to create-nodes

x86_64 is the canonicalized arch for amd64 in Nova[1]. I think it makes
sense to make our scripts (and thus our UI) a bit friendlier by making
it as an accepted arch value. This will allow for the baremetal flavor
to be created with x86_64 set as cpu_arch in the extra_specs so that if
folks happened to register nodes with x86_64 instead of amd64 in Ironic,
the flavor matching will work.

[1] http://git.openstack.org/cgit/openstack/nova/tree/nova/compute/arch.py#n156

Change-Id: I0f207a5b190bc2df86bc58fc62abc5ac6a93d73f
Improve documentation around usage of cinder-volume-nfs

This change aims at improving the doc around usage of the different
cinder backend elements, particularily cinder-volume-nfs.

We also remove cinder-volume from the BLOCKSTORAGE image elements as
it will be eventually installed as dependency by one of the
cinder-* backend elements.

Change-Id: Id553b15227c0b980702174d7d2a0410ab30dcce4
Merge "Bump VM minimum requirments to 3G"
Merge "Switch to new setup-neutron"
Correct deployment docs WRT setup-baremetal

setup-baremetal's interface changed quite some time ago, in commit
c686f0ea, so the deployment docs have been wrong since then. Correct
them to document the new world order.

Change-Id: Icf7f363b0008c24a14ae7d896e353b7e357bb3ab
Merge "Correct deployment docs WRT setup-baremetal"
Merge "Improve documentation around usage of cinder-volume-nfs"
Merge "Support passing x86_64 to create-nodes"
Use packaged template directory path
Switch back to oslo sphinx