oeqa/selftest/recipetool/devtool: add test for pypi class

oeqa/selftest/recipetool/devtool: add test for pypi class

recipetool now supports the pypi class and python recipes can by created
using the new following syntax:

* recipetool create https://pypi.org/project/<package>
* recipetool create https://pypi.org/project/<package>/<version>
* recipetool create https://pypi.org/project/<package> --version <version>

or the old syntax:
* recipetool create https://files.pythonhosted.org/packages/<...>

So add tests for the new syntax and modify old tests

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>