This change adds 'anaconda' group and 'default_ks_template'
configuration option under that group to ironic configuration file.
Along with this change a new boot_option named 'kickstart' is added
to identify anaconda kickstart deploy in the boot interface.
deploy_utils.get_boot_option method is modified to check if
node.deploy_interface is set to 'anaconda' and return boot_option
'kickstart'.
This change also validates whether required parameters are set when
the boot_option on the node is set to 'kickstart'.
When boot_option is 'kickstart' we also validate if the glance image
source has 'squashfs_id' property associated with it.
Change-Id: I2ef7c33e2e63e6d08c084b4c5dbd77a44ddd2d14
Story: 2007839
Task: 41675
26040d4563