Add support of facts gathering WWNs on AIX OS (#51704)

* Extend git commit c65909d6db "Add network fact to obtain FC WWN initiator ports"
adding support of enumerating AIX device WWN ports

$ lsdev -Cc adapter -l fcs*
fcs0 Defined   00-00 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs1 Defined   00-01 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs2 Available 04-00 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs3 Available 04-01 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)

$ lscfg -vpl fcs3 | grep 'Network Address'
        Network Address.............10000090FA551509

* no self in this code

* Two fixes:

- fix run_command execution, passing 'use_unsafe_shell=True' since we have a pipe in it ( | grep )
  if we don't set unsafe shell, it will return error on execution.

- strip new line characters at the end of WWNs.

* fix pep8 , E225 missing whitespace around operator

* use module.get_bin_path() instead of hardcoded values

* move module.get_bin_path() out of for loop

* use python string parsing instead of calling external grep

* use in operator instead of find() for simplicity and readability

* add changelog fragment

changelogs/fragments/fibre_channel_wwn_fact_aix.yaml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - gather Fibre Channel WWNs fact on AIX (extends https://github.com/ansible/ansible/pull/37043)

lib/ansible/module_utils/facts/network/fc_wwn.py

@@ -59,4 +59,24 @@ class FcWwnInitiatorFactCollector(BaseFactCollector):
                 for line in fcinfo_out.splitlines():
                     data = line.split(' ')
                     fc_facts['fibre_channel_wwn'].append(data[-1].rstrip())
+        elif sys.platform.startswith('aix'):
+            # get list of available fibre-channel devices (fcs)
+            cmd = module.get_bin_path('lsdev')
+            cmd = cmd + " -Cc adapter -l fcs*"
+            rc, lsdev_out, err = module.run_command(cmd)
+            if lsdev_out:
+                lscfg_cmd = module.get_bin_path('lscfg')
+                for line in lsdev_out.splitlines():
+                    # if device is available (not in defined state), get its WWN
+                    if 'Available' in line:
+                        data = line.split(' ')
+                        cmd = lscfg_cmd + " -vl %s" % data[0]
+                        rc, lscfg_out, err = module.run_command(cmd)
+                        # example output
+                        # lscfg -vpl fcs3 | grep "Network Address"
+                        #        Network Address.............10000090FA551509
+                        for line in lscfg_out.splitlines():
+                            if 'Network Address' in line:
+                                data = line.split('.')
+                                fc_facts['fibre_channel_wwn'].append(data[-1].rstrip())
         return fc_facts