Remove one changes files from master (0.2.7) that already got merged into changelogs for 0.2.6.4-rc

changes/bug15033

-  o Minor bugfixes (tests):
-    - When running the zero-length-keys check, do not use the default
-      torrc file. Fixes bug 15033; bugfix on 0.2.6.3-alpha. Reported
-      by "reezer".