ios_facts: Report space of file systems (#41850)

* ios_facts: Report file system space

Parse total and free space from dir output. For this, add a hash
filesystems_info containing the keys spacetotal_kb and spacefree_kb.

* ios_facts: Add unit test for file system space reporting

* ios_facts: Add integration test for file system space reporting

test/integration/targets/ios_facts/tests/cli/all_facts.yaml

@@ -28,4 +28,8 @@
       - "result.ansible_facts.ansible_net_memfree_mb > 1"
       - "result.ansible_facts.ansible_net_memtotal_mb > 1"
 
+- assert:
+    that: "{{ item.value.spacetotal_kb }} > {{ item.value.spacefree_kb }}"
+  loop: "{{ lookup('dict', result.ansible_facts.ansible_net_filesystems_info, wantlist=True) }}"
+
 - debug: msg="END cli/all_facts.yaml on connection={{ ansible_connection }}"

test/integration/targets/ios_facts/tests/cli/default_facts.yaml

@@ -28,4 +28,8 @@
       # ... and not present
       - "result.ansible_facts.ansible_net_config is not defined" # config
 
+- assert:
+    that: "{{ item.value.spacetotal_kb }} > {{ item.value.spacefree_kb }}"
+  loop: "{{ lookup('dict', result.ansible_facts.ansible_net_filesystems_info, wantlist=True) }}"
+
 - debug: msg="END cli/default.yaml on connection={{ ansible_connection }}"

test/integration/targets/ios_facts/tests/cli/not_hardware.yaml

@@ -26,5 +26,6 @@
       - "result.ansible_facts.ansible_net_interfaces | length > 1" # more than one interface returned
       # ... and not present
       - "result.ansible_facts.ansible_net_filesystems is not defined"
+      - "result.ansible_facts.ansible_net_filesystems_info is not defined"
 
 - debug: msg="END cli/not_hardware_facts.yaml on connection={{ ansible_connection }}"