[report] Don't use sysroot for network device enumeration

If sos is being used in a live environment to diagnose an issue, using
sysroot can cause the network device enumeration via /sys/class/net
crawling to fail. This will be the case for systems that do not use
`nmcli`.

When in a live environment, network devices will not be under
`/$sysroot/sys/class/net` but the "regular" path for the booted
environment. Similarly, if sos is being run in a container that is
properly configured, network devices will appear under `/sys/class/net`
and not (necessarily) under the sysroot path that mounts the host's
filesystem.

As such, disregard a configured sysroot when enumerating network devices
by crawling `/sys/class/net`, and trap any exceptions that may percolate
up from this in edge case environments.

Closes: sosreport#3307

Signed-off-by: Jake Hunsaker <jacob.r.hunsaker@gmail.com>

sos/report/__init__.py

@@ -612,10 +612,18 @@ def _get_eth_devs(self, namespace=None):
         filt_devs = ['bonding_masters']
         _eth_devs = []
         if not namespace:
-            _eth_devs = [
-                dev for dev in listdir('/sys/class/net', self.opts.sysroot)
-                if dev not in filt_devs
-            ]
+            try:
+                # Override checking sysroot here, as network devices will not
+                # be under the sysroot in live environments or in containers
+                # that are correctly setup to collect from the host
+                _eth_devs = [
+                    dev for dev in listdir('/sys/class/net', None)
+                    if dev not in filt_devs
+                ]
+            except Exception as err:
+                self.soslog.warning(
+                    f'Failed to manually determine network devices: {err}'
+                )
         else:
             try:
                 _nscmd = "ip netns exec %s ls /sys/class/net" % namespace