adding arista veos definition (#22)

* initial veos yaml build

* adding veos directory and README

* removing vEOS from outside of parent dir

* fixing README

* modifing README and YAML settings for definition

node-definitions/arista/veos/README.md

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+# Arista vEOS CML node definition 
+
+This directory contains the following node definitions:
+
+* vEOS.yaml - Arista vEOS node definition 
+
+### Image 
+
+A valid vEOS image can be downloaded the through Arista support portal. https://www.arista.com/en/support/software-download
+
+### Notes
+
+This node definition uses recommended values for vEOS instances. However, lowering the DRAM to 1.5GB should theoritically work but YMMV. 
+
+
+
+

node-definitions/arista/veos/vEOS.yaml

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+id: vEOS
+general:
+  description: Arista vEOS
+  nature: switch
+  read_only: false
+device:
+  interfaces:
+    has_loopback_zero: true
+    physical:
+      - eth0
+      - eth2
+      - eth3
+      - eth4
+      - eth5
+      - eth6
+      - eth7
+      - eth9
+      - eth10
+      - eth11
+      - eth12
+      - eth13
+    serial_ports: 1
+    default_count: 5
+    loopback:
+      - l0
+ui:
+  description: |-
+    Arista vEOS
+
+    2 GB DRAM, 2 vCPU
+
+    [Link](https://www.arista.com/en/cg-veos-router/veos-router-overview)
+  visible: true
+  label_prefix: veos-
+  icon: switch
+  label: vEOS
+sim:
+  linux_native:
+    libvirt_domain_driver: kvm
+    driver: server
+    disk_driver: sata
+    ram: 2048
+    cpus: 2
+    cpu_limit: 100
+    nic_driver: virtio
+boot:
+  timeout: 180
+inherited:
+  image:
+    ram: true
+    cpus: true
+    cpu_limit: true
+    data_volume: true
+    boot_disk_size: true
+  node:
+    ram: true
+    cpus: true
+    cpu_limit: true
+    data_volume: true
+    boot_disk_size: true
+configuration:
+  generator:
+    driver: null
+schema_version: 0.0.1