Remove unused undercloud_post_install_script and its log

Remove unused undercloud_post_install_script and log from parameters
and documentation since it's not used anymore.

Change-Id: I88de9555b17d83b1359e2d7ca88a99818f3e07a1

roles/undercloud-deploy/README.md

@@ -15,12 +15,8 @@ Role Variables
 used as the base for the undercloud.conf
 - `undercloud_install_script`: <'undercloud-install.j2'> -- the name of the jinja template
 used as the base for the undercloud-install bash script
-- `undercloud_post_install_script`: <'undercloud-install-post.sh.j2'> -- the name of the
-jinja template used as the base for the undercloud-install-post bash script
 - `undercloud_install_log`: <'{{ working_dir }}/undercloud_install.log'> -- the full path
 to the undercloud install log file.
-- `undercloud_post_install.log`: <'{{ working_dir }}/undercloud_post_install.log'> -- the full
-path to the undercloud-post-install.sh log file.
 - `network_environment_file`: <'network-environment.yaml.j2'> -- the name of the jinja template
 used as the base for the network-environment for tripleo.
 - `undercloud_hieradata_override_file`: <'quickstart-hieradata-overrides.yaml.j2'> -- the name of

roles/undercloud-deploy/defaults/main.yml

@@ -2,9 +2,7 @@
 
 undercloud_config_file: undercloud.conf.j2
 undercloud_install_script: undercloud-install.sh.j2
-undercloud_post_install_script: undercloud-install-post.sh.j2
 undercloud_install_log: "{{ working_dir }}/undercloud_install.log"
-undercloud_post_install_log: "{{ working_dir }}/undercloud_post_install.log"
 network_environment_file: network-environment.yaml.j2
 undercloud_hieradata_override_file: quickstart-hieradata-overrides.yaml.j2