Fix bug where ansible_lvm facts silently fails if a PV isn't in an VG (#28684)

If a PV hasn't been added to a VG i.e.:

[pmcclory@box ~]$ sudo pvs --noheadings --nosuffix --units g
  /dev/xvdb       lvm2 ---- 10.00 10.00
  /dev/xvdv1 vg0  lvm2 a--u 24.99     0

Than ansible_facts.ansible_lvm will be unset after running setup module.

The issue is that the module splits on whitespace, which causes an
indexing error when the VG column is empty.

Fix is to add the separator field and safely split on that.

lib/ansible/module_utils/facts/hardware/linux.py

@@ -663,7 +663,7 @@ class LinuxHardware(Hardware):
         lvm_facts = {}
 
         if os.getuid() == 0 and self.module.get_bin_path('vgs'):
-            lvm_util_options = '--noheadings --nosuffix --units g'
+            lvm_util_options = '--noheadings --nosuffix --units g --separator ,'
 
             vgs_path = self.module.get_bin_path('vgs')
             # vgs fields: VG #PV #LV #SN Attr VSize VFree
@@ -671,7 +671,7 @@ class LinuxHardware(Hardware):
             if vgs_path:
                 rc, vg_lines, err = self.module.run_command('%s %s' % (vgs_path, lvm_util_options))
                 for vg_line in vg_lines.splitlines():
-                    items = vg_line.split()
+                    items = vg_line.split(',')
                     vgs[items[0]] = {'size_g': items[-2],
                                      'free_g': items[-1],
                                      'num_lvs': items[2],
@@ -684,7 +684,7 @@ class LinuxHardware(Hardware):
             if lvs_path:
                 rc, lv_lines, err = self.module.run_command('%s %s' % (lvs_path, lvm_util_options))
                 for lv_line in lv_lines.splitlines():
-                    items = lv_line.split()
+                    items = lv_line.split(',')
                     lvs[items[0]] = {'size_g': items[3], 'vg': items[1]}
 
             pvs_path = self.module.get_bin_path('pvs')
@@ -693,7 +693,7 @@ class LinuxHardware(Hardware):
             if pvs_path:
                 rc, pv_lines, err = self.module.run_command('%s %s' % (pvs_path, lvm_util_options))
                 for pv_line in pv_lines.splitlines():
-                    items = pv_line.split()
+                    items = pv_line.split(',')
                     pvs[self._find_mapper_device_name(items[0])] = {
                         'size_g': items[4],
                         'free_g': items[5],