Accepting request 671988 from home:frispete:python

By now, the cffi dependency is fullfilled by chance, but back than,
I managed a situation, where pyOpenSSL was installed, but dysfunctional,
because cffi was missing...

- add local-intersphinx-inventories.patch for generating the docs
  correctly
- add fetch-intersphinx-inventories.sh to fetch the inventories

- add missing python-cffi dependency

OBS-URL: https://build.opensuse.org/request/show/671988
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-pyOpenSSL?expand=0&rev=54

local-intersphinx-inventories.patch

@@ -0,0 +1,13 @@
+Index: b/doc/conf.py
+===================================================================
+--- a/doc/conf.py
++++ b/doc/conf.py
+@@ -254,6 +254,6 @@ man_pages = [
+ ]
+ 
+ intersphinx_mapping = {
+-    "https://docs.python.org/3": None,
+-    "https://cryptography.io/en/latest/": None,
++    "https://docs.python.org/3": "python3.inv",
++    "https://cryptography.io/en/latest/": "crypto.inv",
+ }