authkeys file need not be 0700...

0600 is sufficient.

Caught by Christoph.  I don't actually think there is any possibility of this
being used to attack gitolite but it's just a 1-bit change :)

ref: https://groups.google.com/forum/#!topic/gitolite/C_kzny--yP8

src/triggers/post-compile/ssh-authkeys

@@ -82,7 +82,7 @@ sub sanity {
     _mkdir( $akdir, 0700 ) if not -d $akdir;
     if ( not -f $akfile ) {
         _print( $akfile, "" );
-        chmod 0700, $akfile;
+        chmod 0600, $akfile;
     }
 }