Allow to exclude roles from plays with --exclude-roles command line parameter

tasks/main.yml

 ---
 # file: roles/serverdensity/tasks/main.yml
 
-- include: uninstallv1.yml
-  when: sd_uninstallv1
-
-- name: "ServerDensity | Init SD plugin"
-  local_action:
-    serverdensity
-    api_token={{ sd_api_token }}
-    cleanup={{ sd_alert_cleanup }}
-    force={{ sd_force_update }}
-    cache={{ sd_api_cache_file }}
-  when: sd_update_remote
-
-- name: "ServerDensity | Install Public Repo Key"
-  apt_key:
-    url={{ sd_repo_public_key_uri }}
-    state=present
-
-- name: "ServerDensity | Add ServerDensity Repository To Apt"
-  copy:
-    content='deb http://archive.serverdensity.com/ubuntu/ all main'
-    dest=/etc/apt/sources.list.d/sd-agent.list
-    mode=644
-
-- name: "ServerDensity | Install The Agent"
-  apt:
-    pkg=sd-agent
-    state=installed
-    update_cache=yes
-  notify: "ServerDensity | Restart Agent"
-
-- name: "ServerDensity | Create Plugins Directory"
-  file:
-    dest={{ sd_agent_plugins_dir }}
-    state=directory
-    mode=755
-
-- name: "ServerDensity | Copy Plugins"
-  copy:
-    src={{ sd_plugins_files_dir }}/{{ item }}
-    dest={{ sd_agent_plugins_dir }}/{{ item }}
-  with_items: '{{ sd_plugins }}'
-  when: sd_plugins|length > 0
-  notify: "ServerDensity | Restart Agent"
-
-- name: "ServerDensity | Configure The Agent"
-  template:
-    src={{ item }}
-    dest=/etc/sd-agent/{{ item }}
-    owner=root
-    group=root
-    mode=0644
-  with_items:
-    - 'config.cfg'
-    - 'plugins.cfg'
-    #- 'supervisor.conf'
-  when: sd_agent_key != ''
-  notify: "ServerDensity | Restart Agent"
-
-- include: apache.yml
-  when: sd_groups.apache != 'none' and inventory_hostname in groups[sd_groups.apache]
-
-- include: mysql.yml
-  when: sd_groups.mysql != 'none' and inventory_hostname in groups[sd_groups.mysql]
+- include: serverdensity.yml
+  when: '"serverdensity" not in excluded_roles'

tasks/serverdensity.yml

+---
+# file: roles/serverdensity/tasks/serverdensity.yml
+
+- include: uninstallv1.yml
+  when: sd_uninstallv1
+
+- name: "ServerDensity | Init SD plugin"
+  local_action:
+    serverdensity
+    api_token={{ sd_api_token }}
+    cleanup={{ sd_alert_cleanup }}
+    force={{ sd_force_update }}
+    cache={{ sd_api_cache_file }}
+  when: sd_update_remote
+
+- name: "ServerDensity | Install Public Repo Key"
+  apt_key:
+    url={{ sd_repo_public_key_uri }}
+    state=present
+
+- name: "ServerDensity | Add ServerDensity Repository To Apt"
+  copy:
+    content='deb http://archive.serverdensity.com/ubuntu/ all main'
+    dest=/etc/apt/sources.list.d/sd-agent.list
+    mode=644
+
+- name: "ServerDensity | Install The Agent"
+  apt:
+    pkg=sd-agent
+    state=installed
+    update_cache=yes
+  notify: "ServerDensity | Restart Agent"
+
+- name: "ServerDensity | Create Plugins Directory"
+  file:
+    dest={{ sd_agent_plugins_dir }}
+    state=directory
+    mode=755
+
+- name: "ServerDensity | Copy Plugins"
+  copy:
+    src={{ sd_plugins_files_dir }}/{{ item }}
+    dest={{ sd_agent_plugins_dir }}/{{ item }}
+  with_items: '{{ sd_plugins }}'
+  when: sd_plugins|length > 0
+  notify: "ServerDensity | Restart Agent"
+
+- name: "ServerDensity | Configure The Agent"
+  template:
+    src={{ item }}
+    dest=/etc/sd-agent/{{ item }}
+    owner=root
+    group=root
+    mode=0644
+  with_items:
+    - 'config.cfg'
+    - 'plugins.cfg'
+    #- 'supervisor.conf'
+  when: sd_agent_key != ''
+  notify: "ServerDensity | Restart Agent"
+
+- include: apache.yml
+  when: sd_groups.apache != 'none' and inventory_hostname in groups[sd_groups.apache]
+
+- include: mysql.yml
+  when: sd_groups.mysql != 'none' and inventory_hostname in groups[sd_groups.mysql]