Various improvements to issue/pull-request templates

- Instruct to verify if an issue/request already exists
- Use uppercase for titles (easier to parse as titles)
- Remove empty lines where it makes sense (instructions)
- Ensure that commit-message appears directly under summary (pull-requests)

.github/ISSUE_TEMPLATE.md

@@ -1,55 +1,50 @@
-##### Issue Type:
+<!--- Verify first that your issue/request is not already reported in GitHub -->
 
-<!--- Please pick one and delete the rest: -->
+##### ISSUE TYPE
+<!--- Pick one below and delete the rest: -->
  - Bug Report
  - Feature Idea
  - Documentation Report
 
-##### Ansible Version:
 
+##### ANSIBLE VERSION
 ```
-<!--- Paste verbatim output from “ansible --version” here -->
+<!--- Paste verbatim output from “ansible --version” between quotes -->
 ```
 
-##### Ansible Configuration:
-
+##### CONFIGURATION
 <!---
-Please mention any settings you have changed/added/removed in ansible.cfg
+Mention any settings you have changed/added/removed in ansible.cfg
 (or using the ANSIBLE_* environment variables).
 -->
 
-##### Environment:
-
+##### OS / ENVIRONMENT
 <!---
-Please mention the OS you are running Ansible from, and the OS you are
+Mention the OS you are running Ansible from, and the OS you are
 managing, or say “N/A” for anything that is not platform-specific.
 -->
 
-##### Summary:
-
+##### SUMMARY
 <!--- Please explain the problem briefly -->
 
-##### Steps To Reproduce:
-
+##### STEPS TO REPRODUCE
 <!---
 For bugs, please show exactly how to reproduce the problem. For new
 features, show how the feature would be used.
 -->
 
 ```
-<!--- Paste example playbooks or commands here -->
+<!--- Paste example playbooks or commands between quotes -->
 ```
 
 <!--- You can also paste gist.github.com links for larger files -->
 
-##### Expected Results:
-
+##### EXPECTED RESULTS
 <!--- What did you expect to happen when running the steps above? -->
 
-##### Actual Results:
-
+##### ACTUAL RESULTS
 <!--- What actually happened? If possible run with high verbosity (-vvvv) -->
 
 ```
-<!--- Paste verbatim command output here -->
+<!--- Paste verbatim command output between quotes -->
 ```

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,20 +1,17 @@
-##### Issue Type:
-
-<!--- Please pick one and delete the rest: -->
+##### ISSUE TYPE
+<!--- Pick one below and delete the rest: -->
  - Feature Pull Request
  - New Module Pull Request
  - Bugfix Pull Request
  - Docs Pull Request
 
-##### Ansible Version:
-
+##### ANSIBLE VERSION
 ```
-<!--- Paste verbatim output from “ansible --version” here -->
+<!--- Paste verbatim output from “ansible --version” between quotes -->
 ```
 
-##### Summary:
-
-<!--- Please describe the change and the reason for it -->
+##### SUMMARY
+<!--- Describe the change, including rationale and design decisions -->
 
 <!---
 If you are fixing an existing issue, please include "Fixes #nnn" in your
@@ -22,8 +19,6 @@ commit message and your description; but you should still explain what
 the change does.
 -->
 
-##### Example output:
-
 ```
-<!-- Paste verbatim command output here if necessary -->
+<!-- Paste verbatim command output here, e.g. before and after your change -->
 ```