Add network-cloud type

This change introduces an outline of the network-cloud type, which will
aim to provide Airship configuration suitable for performance-intensive
telecommunication and networking workloads according to the CNTT
specification.

Most documents include in this type inherit from the airship-core type;
however, this type will evolve to include type-specific documents in the
future.

Change-Id: I98344649ca55dc00151734963265b26d28deec68

manifests/type/network-cloud/README.md

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+# Network-cloud Type
+
+The network type provides Airship configuration suitable for
+performance-intensive telecommunication and networking workloads. A placeholder
+for now, the network-cloud type will evolve to meet the specifications of the
+[Cloud iNfrastructure Telco Task Force (CNTT)](https://github.com/cntt-n/CNTT).

manifests/type/network-cloud/ephemeral/bootstrap/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../../airship-core/ephemeral/bootstrap

manifests/type/network-cloud/ephemeral/controlplane/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../../airship-core/ephemeral/controlplane

manifests/type/network-cloud/ephemeral/initinfra/kustomization.yaml

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+resources:
+  - ../../../airship-core/ephemeral/initinfra
+commonLabels:
+  airshipit.org/stage: initinfra

manifests/type/network-cloud/shared/catalogues/common-networking.yaml

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+# NOTE(drewwalters96): This patch file is applied to override the
+# airship-core networking catalogue.

manifests/type/network-cloud/shared/catalogues/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../../../airship-core/shared/catalogues
+
+patchesStrategicMerge:
+  - common-networking.yaml