Cleaning up ironic-install defaults yaml file

Added comments to variables for better documentation of the
ironic-install variables and cleaned up the file by removing
un-necessary items.

roles/ironic-install/defaults/main.yml

@@ -2,6 +2,7 @@
 # Cleaning turns on ironic conductor clean_nodes flag
 # chich causes the nodes to be wiped after deletion.
 cleaning: true
+# The list of required packages for this role to install.
 required_packages_ubuntu:
   - mysql-server
   - dnsmasq
@@ -29,21 +30,20 @@ required_packages_ubuntu:
   - kpartx
 http_boot_folder: /httpboot
 ironicclient_source_install: false
-ironic_url: "http://localhost:6385/"
-ssh_public_key_path: "{{ ansible_env.HOME }}/.ssh/id_rsa.pub"
 shade_source_install: false
+# Configuration information for diskimage-builder
 dib_env_vars:
   DIB_CLOUD_INIT_DATASOURCES: "ConfigDrive"
   ELEMENTS_PATH: "/opt/stack/diskimage-builder/elements"
 # extra_dib_elements is a space separated list of elements.
 extra_dib_elements: ""
+# Setting to utilize diskimage-builder to create a bootable image.
 create_image_via_dib: true
+# Setting to prepend a partition image with a boot sector and partition table.
 transform_boot_image: false
-##mysql_password:
 # If testing is true, then the environment is setup for using libvirt
 # virtual machines for the hardware instead of real hardware.
 testing: false
-http_boot_folder: /httpboot
 latest_os_ironic_url: https://raw.githubusercontent.com/juliakreger/ansible-modules-extras/features/new-openstack/cloud/os_ironic.py
 latest_os_ironic_node_url: https://raw.githubusercontent.com/juliakreger/ansible-modules-extras/features/new-openstack/cloud/os_ironic_node.py
 deploy_kernel: "{{http_boot_folder}}/coreos_production_pxe.vmlinuz"
@@ -52,12 +52,3 @@ deploy_kernel_url: "http://{{ hostvars[inventory_hostname]['ansible_' + network_
 deploy_ramdisk_url: "http://{{ hostvars[inventory_hostname]['ansible_' + network_interface]['ipv4']['address'] }}:8080/coreos_production_pxe_image-oem.cpio.gz"
 deploy_image_filename: "trusty-server-cloudimg-amd64.img"
 deploy_image: "{{http_boot_folder}}/{{deploy_image_filename}}"
-# ipv4_subnet_mask is intended for the static ipv4 address assignments.
-##ipv4_subnet_mask: 255.255.255.0
-##ipv4_gateway: 192.168.1.1
-##ipv4_nameserver: 8.8.8.8
-##dhcp_pool_start: 192.168.1.200
-##dhcp_pool_end: 192.168.1.250
-# ipmi_bridging: Default undefined.  Valid values: "no", "single", and "dual"
-# See http://docs.openstack.org/developer/ironic/_modules/ironic/drivers/modules/ipmitool.html
-#ipmi_bridging: no