gdb: restructure disable_breakpoints_in_unloaded_shlib

This commit rewrites disable_breakpoints_in_unloaded_shlib to be more
like disable_breakpoints_in_freed_objfile.  Instead of looping over
all b/p locations, we instead loop over all b/p and then over all
locations for each b/p.

The advantage of doing this is that we can fix the small bug that was
documented in a comment in the code:

  /* This may cause duplicate notifications for the same breakpoint.  */
  notify_breakpoint_modified (b);

By calling notify_breakpoint_modified() as we modify each location we
can potentially send multiple notifications for a single b/p.

Is this a bug?  Maybe not.  After all, at each notification one of the
locations will have changed, so its probably fine.  But it's not
ideal, and we can easily do better, so lets do that.

There's a new test which checks that we only get a single notification
when the shared library is unloaded.  Note that the test is written as
if there are multiple related but different tests within the same test
file ... but there aren't currently!  The next commit will add another
test proc to this test script at which point the comments will make
sense.  I've done this to avoid unnecessary churn in the next commit.

Tested-By: Hannes Domani <ssbssa@yahoo.de>
Approved-By: Tom Tromey <tom@tromey.com>

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