Several shell completion fixes

- fix network filters
- add prune filters
- pod create --share support comma separated namespaces

[NO TESTS NEEDED]

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

docs/source/markdown/podman-volume-ls.1.md

@@ -16,7 +16,14 @@ flag. Use the **--quiet** flag to print only the volume names.
 
 #### **--filter**=*filter*, **-f**
 
-Filter volume output.
+Volumes can be filtered by the following attributes:
+
+- dangling
+- driver
+- label
+- name
+- opt
+- scope
 
 #### **--format**=*format*