Commits on Apr 9, 2019

1. Implement 'this' from proposal 74 …

   As discussed in ansible/proposals#74 it is very convenient to be able to access the task result directly from `changed_when`, `failed_when` and `until`.
   
   For this we reserve the keyword 'this'.
   
   Examples:
   
   ```yaml
     # Wait until file exists
     - stat:
         path: /tmp/some.file
       until: this.stat.exists
   
     # Fail task when both files are identical
     - raw: diff foo/file1 bar/file2
       failed_when: this.rc == 0
   
     # Report a change when rc is not 2
     - shell: /usr/bin/billybass --mode="take me to the river"
       changed_when: this.rc != 2
   ```

   

   dagwieers committed Apr 9, 2019
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