Make use of yes/no booleans in playbooks

At the moment Ansible prefers yes/no for module booleans, however booleans in playbooks are still using True/False, rather than yes/no. This changes modifies boolean uses in playbooks (and man pages) to favor yes/no rather than True/False.

This change includes:

- Adaptation of documentation and examples to favor yes/no
- Modification to manpage output to favor yes/no (the docsite output already favors yes/no)

docsite/rst/YAMLSyntax.rst

@@ -54,6 +54,8 @@ Ansible doesn't really use these too much, but you can also specify a
 boolean value (true/false) in several forms::
 
     ---
+    create_key: yes
+    needs_agent: no
     knows_oop: True
     likes_emacs: TRUE
     uses_cvs: false

docsite/rst/playbooks.rst

@@ -88,14 +88,14 @@ Support for running things from sudo is also available::
     ---
     - hosts: webservers
       user: yourname
-      sudo: True
+      sudo: yes
 
 You can also login as you, and then sudo to different users than root::
 
     ---
     - hosts: webservers
       user: yourname
-      sudo: True
+      sudo: yes
       sudo_user: postgres
 
 If you need to specify a password to sudo, run `ansible-playbook` with ``--ask-sudo-pass`` (`-K`).

docsite/rst/playbooks2.rst

@@ -67,7 +67,7 @@ write a task that looks like this::
 
     - name: this will not be counted as a failure
       action: command /bin/false
-      ignore_errors: True
+      ignore_errors: yes
 
 Accessing Complex Variable Data
 ```````````````````````````````
@@ -190,10 +190,10 @@ some other options, but otherwise works equivalently::
    vars_prompt:
      - name: "some_password"
        prompt: "Enter password"
-       private: True
+       private: yes
      - name: "release_version"
        prompt: "Product release version"
-       private: False
+       private: no
 
 
 Passing Variables On The Command Line
@@ -543,7 +543,7 @@ can turn off fact gathering.  This has advantages in scaling ansible in push mod
 systems, mainly, or if you are using Ansible on experimental platforms.   In any play, just do this::
 
     - hosts: whatever
-      gather_facts: False
+      gather_facts: no
 
 Pull-Mode Playbooks
 ```````````````````
@@ -663,9 +663,9 @@ if you have a large number of hosts::
 
     # set up the fireball transport
     - hosts: all
-      gather_facts: False
+      gather_facts: no
       connection: ssh # or paramiko
-      sudo: True
+      sudo: yes
       tasks:
           - action: fireball
 
@@ -683,8 +683,8 @@ any platform.  You will also need gcc and zeromq-devel installed from your packa
 
     ---
     - hosts: all
-      sudo: True
-      gather_facts: False
+      sudo: yes
+      gather_facts: no
       connection: ssh
       tasks:
           - action: easy_install name=pip