Align custom scripts with generic scripts (#445)

Align custom scripts with generic scripts, making them configurable. This has a few advantages:

- script code is more unified,
- no more hard-coded method names in scripts, which is less error prone and make it easier to rename scripts,
- no more hard coded product names in scripts, which is less error prone and make it easier to rename products,
- less hard-coded URLs and regexes in scripts, which makes auto-configuration more expressive / updatable,

Also added method `endoflife.list_configs_from_argv()` so that it is easier to manipulate scripts arguments.

src/cgit.py

@@ -1,16 +1,10 @@
-import sys
-
 from bs4 import BeautifulSoup
 from common import dates, endoflife, http, releasedata
 
 """Fetches versions from repositories managed with cgit, such as the Linux kernel repository.
 Ideally we would want to use the git repository directly, but cgit-managed repositories don't support partial clone."""
 
-METHOD = "cgit"
-
-p_filter = sys.argv[1] if len(sys.argv) > 1 else None
-m_filter = sys.argv[2] if len(sys.argv) > 2 else None
-for config in endoflife.list_configs(p_filter, METHOD, m_filter):
+for config in endoflife.list_configs_from_argv():
     with releasedata.ProductData(config.product) as product_data:
         response = http.fetch_url(config.url + '/refs/tags')
         soup = BeautifulSoup(response.text, features="html5lib")