[TIP] py.test plugins specified with -h are not loaded with xdist

[Yoann Roman]

I have a custom py.test plugin in a package. When I load it with
py.test -h package.plugin, it loads fine. When I use py.test -h
package.plugin -n 4, the main session loads it, but the plugin isn't
loaded by the separate 4 processes running the tests.

Is that expected behavior? Is using a conftest.py file the only way to
get a project-specific plugin loaded?

-- 
Yoann Roman