test-resolve.t: add some output to show order of operations

This basically shows the behavior of resolve with multiple files. An upcoming
behavior change will cause this output to also change.

tests/test-resolve.t

@@ -133,8 +133,10 b' resolve without arguments should suggest'
   [255]
 
 resolve --all should re-merge all unresolved files
-  $ hg resolve -q --all
+  $ hg resolve --all
+  merging file1
   warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
+  merging file2
   warning: conflicts while merging file2! (edit, then use 'hg resolve --mark')
   [1]
   $ grep '<<<' file1 > /dev/null