[PATCH] test: make test_expect_equal_file() arguments flexible

[Tomi Ollila]

There are at least these options here

1) go through all ~100 places where test_expect_equal_file is used
   and fix the call order: quick look tells that the offending uses
   are in dump-restore, hooks, search-limiting and symbol-hiding.

2) enforce "expected" filename has some format *and* fix all current
   uses of it. Add testbed_error () function which yells loudly ane exits...

3) guess which is output and which is expected from args so that 
   machine helps tester here (for both diff output & copied files)a

4) just copy compared files to some directory, those are named as
   basename of the original -- diff order still inconsistent.


I'd just go with option 1 and fix new *violations* when stumble upon one.

Tomi