Make role multiplatform

- On debian 11 strongswan daemon has different name
- Make config file backups when overwriting
- Add closeaction configuration option
- More metadata fixes
- Change tests to run standalone

Change-Id: I04474cb4601060059c4e603560d1873ad6598a77
diff --git a/vars/Debian.yml b/vars/Debian.yml
index 90f8855..c476543 100644
--- a/vars/Debian.yml
+++ b/vars/Debian.yml
@@ -8,4 +8,4 @@
 # Put all other variables in the 'defaults/main.yml' file.
 
 strongswan_package: strongswan
-strongswan_service: strongswan
+strongswan_service: strongswan-starter