Remove old example env file

This hasn't been recommended as a deployment method for a while and
it won't work in OVB 2.0.

templates/env.yaml.example

@@ -1,59 +0,0 @@
-# DEPRECATED: This sample environment file has been replaced by the one in
-# environments/base.yaml and the other sample environments in that directory.
-# This file should not be used for new OVB deployments.
-
-parameters:
-  bmc_flavor: bmc
-  bmc_image: CentOS-7-x86_64-GenericCloud
-  baremetal_flavor: baremetal
-  baremetal_image: ipxe-boot
-  key_name: default
-  private_net: private
-  bmc_prefix: bmc
-  baremetal_prefix: baremetal
-  node_count: 2
-  public_net: public
-  provision_net: provision
-  # QuintupleO-specific params ignored by virtual-baremetal.yaml
-  undercloud_name: undercloud
-  undercloud_image: CentOS-7-x86_64-GenericCloud
-  undercloud_flavor: m1.xlarge
-  external_net: external
-  public_net_shared: false
-  provision_net_shared: false
-
-#parameter_defaults:
-  # Set a default role for the nodes in this environment.  This parameter is
-  # ignored by Heat, but used by build-nodes-json.
-  #role: control
-
-## Uncomment and customize the following to use an existing floating ip
-#  undercloud_floating_ip_id: 'uuid of floating ip'
-#  undercloud_floating_ip: 'address of floating ip'
-
-#resource_registry:
-## Uncomment the following to use an existing floating ip
-#  OS::OVB::UndercloudFloating: templates/undercloud-floating-existing.yaml
-
-## Uncomment the following to use no floating ip
-#  OS::OVB::UndercloudFloating: templates/undercloud-floating-none.yaml
-
-## Uncomment the following to create a private network
-#  OS::OVB::PrivateNetwork: templates/private-net-create.yaml
-
-## Uncomment to create all networks required for network-isolation.
-## parameter_defaults should be used to override default parameter values
-## in baremetal-networks-all.yaml
-#  OS::OVB::BaremetalNetworks: templates/baremetal-networks-all.yaml
-#  OS::OVB::BaremetalPorts: templates/baremetal-ports-all.yaml
-
-## Uncomment to use the neutron port-security extension to allow DHCP from
-## the undercloud to overcloud nodes.  There are *-port-security.yaml versions
-## of all the standard port resource templates.  The examples below are to use
-## port-security with a minimal deployment (i.e. no network isolation).
-#  OS::OVB::BaremetalPorts: templates/baremetal-ports-default-port-security.yaml
-#  OS::OVB::BMCPort: templates/bmc-port-port-security.yaml
-#  OS::OVB::UndercloudPorts: templates/undercloud-ports-port-security.yaml
-
-## Uncomment to deploy a quintupleo environment without an undercloud.
-#  OS::OVB::UndercloudEnvironment: OS::Heat::None