Fix formatting and indentation problems in third_party.rst

This patch fixes several nested bullets and other formatting problems
in the Requirements section of third_party.rst.

Change-Id: Ia071e87177b25f9b63cf185c932f0d29ebd3a475

doc/source/third_party.rst

@@ -45,16 +45,17 @@ Requirements
   This should include:
 
   * Environment details
+
     * This must include a utc timestamp of the test run
   * Test configuration
 
     * Skipped tests
     * logs should include a trace of the commands used
   * OpenStack logs
   * Tempest logs (including ``testr_results.html.gz``)
+
     * logs must be browsable; logs requiring download, installation or login
       to access are not acceptable
-
   Note: all test artifacts must be retained for one month.
 
 Reading the Event Stream