[cpp-netlib-devel] localhost_tests cleanup

[K. G. <kim...@gm...>]

Hello,

I've spent a couple of hours getting used to Boost, cpp-netlib, etc,
and spent those cleaning up localhost_tests.cpp. Here's a patch that
does a lot:

- extracts http_test_server.hpp wrapping ShellExecuteEx/fork
- http_test_server no longer stops with an error dialog if Python is
not installed, but rather fails with an error message on the console
- uses global fixture for starting/stopping the Python test server
(independent of test run order)
- cleaned some file i/o out of text_file_query and binary_file_query
into helper function readfile
- consistent tab size in localhost_tests.cpp
- added adjust_lineendings, used with text_file_query to make the
source data match the output from the Python server (LF-only
line-endings)

I wish I could've offered these one-by-one, but it would turn into a
versioning nightmare to apply the patches in order. I think most of
the changes are benign, I'm a little doubtful of the last one, but
until I've fully understood Divye, this is a workaround to make it
right on Windows.

Hope it helps,
- Kim