Address admin class has name in search_fields

[pyarun]

Address Model does not have a name field. But django admin model has name in search_fields.

This causes Error in Admin when we search.

Cannot resolve keyword 'name' into field. Choices are: formatted, id, latitude, locality, locality_id, longitude, raw, route, street_number

[banagale]

Thanks for the report, @pyarun.

This looks like a 10 year old mistake in django-address.address.admin

Here's the line.

Here are the valid fields, what were you hoping to search on here?

[pyarun]

I think raw, route, and street_number are good candidates.

If you agree, I will see if I can fix and create an MR.

[banagale]

@pyarun. I agree those are good candidates. If you'd like to create a PR, for this here #130, I'd be happy to review and merge. If you have time to add tests, they're welcome but not absolutely necessary.  I'll push this to next release for now.  

*edit: I left this in 0.2.6 because I pushed it out until next weekend. If you need more time no problem.

[pyarun]

I didn't see any test cases for admin, and I have never written a test for admin, so not sure how to write it.
So i just fixed this issue in admin.

[banagale]

@pyarun, it looks like there are ways to test modeladmin but it is for more sophisticated operations. I tested your fix and it is good. Thank you.