Parametrize Swift partition power

The Swift partition power is currently hard-coded to 10.  While
this is fine for small Swift clusters there are some users who
will want to configure rings with higher partition powers.  We
have parametrized the value of the partition power, and the
default is set to 10.

Change-Id: If115cf5cf2f4c2ff7d28b0f5ae3d2ca3f4b4be5a
Use the server name attribute

The 'show' attribute results in a nova API call, which has
performance overhead even with attribute memoization.
The name attribute was added to expose the name without needing
an API call, since the resource already knows the name. This
change switches from using 'show' to 'name' throughout.

Change-Id: I1e83dd008cd02e5cec97868db0d5a695f07b7199
Parameterize network type and tunnel types

Remove the hardcoding of gre as the Neutron tenant network type for the
Overcloud. This will enable the ability to deploy an Overcloud that uses
vxlan instead of gre tunnels. A new parameter, NeutronTunnelTypes, is
added to allow configuring the tunnel_types parameter in the Neutron ML2
configuration.

This change is required by https://review.openstack.org/#/c/92913

Change-Id: I2c2e2153a61349e58ada28c87aa2338c9f00e7bd
Merge "Parameterize network type and tunnel types"
Merge "Parametrize Swift partition power"