Fix CI: Remove non-existent identifiers in miq_product_features.yml

[lpichler]

This #840 fix test which checks whether identifiers from api.yml exist in also in miq_product_features.yml.

The test found(CI failure) that instance_add_cloud_network , api_provider_show_list don't exist in miq_product_features.yml.

This PR removes them as they were added here

instance_add_cloud_network - it looks like that it is just duplicating create so it can be removed.

api_provider_show_list - this doesn't exist in miq_product_features.yml and we have already features to show list of providers. (ems_infra_show_list, ems_cloud_show_list, ..)

@gubbe505 is it ok to remove api_provider_show_list or do you have any plans to add api_provider_show_list to miq_product_features.yml in https://github.com/ManageIQ/manageiq/blob/master/db/fixtures/miq_product_features.yml for some action ?

thanks

@miq-bot assign @abellotti
@miq-bot add_label bug, jansa/yes

[abellotti]

Thanks @lpichler for fixing this. 👍

[simaishi]

Removed jansa/yes, #825 isn't backported to jansa branch and this PR isn't needed in jansa.