
##### SUMMARY
NVMe devices can have their serial number read by reading (eg) /sys/block/nvme1n1/device/serial, without having to try and run sg_inq, which requires root.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
Facts collection, linux.py

##### ANSIBLE VERSION
```paste below
$ ansible --version
ansible 2.10.0.dev0
  config file = None
  configured module search path = ['/local/apps/egsadmin/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /local/apps/egsadmin/randy/ansible-src-current/lib/ansible
  executable location = /local/apps/egsadmin/randy/ansible-src-current/bin/ansible
  python version = 3.6.8 (default, Jun 11 2019, 15:15:01) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]

```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
$ ansible-config dump --only-changed
<nothing>
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
AWS NVMe-based systems

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Run setup task with and without "become" on a system or VM with NVMe and observe that "serial" only appears with "become"

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
ansible_devices[*].serial is populated for NVMe, regardless of become

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
ansible_devices[*].serial is populated for NVMe, regardless of become

continue
                    devs_wwn[os.path.basename(wwn_link)] = link_name[4:]
        links = self.get_all_device_links()
        device_facts['device_links'] = links
        for block in block_devs:
            virtual = 1
            sysfs_no_links = 0
            try:
                path = os.readlink(os.path.join("/sys/block/", block))
            except OSError:
                e = sys.exc_info()[1]
                if e.errno == errno.EINVAL:
                    path = block
                    sysfs_no_links = 1
                else:
                    continue
            sysdir = os.path.join("/sys/block", path)
            if sysfs_no_links == 1:
                for folder in os.listdir(sysdir):
                    if "device" in folder:
                        virtual = 0
                        break
            d = {}
            d['virtual'] = virtual
            d['links'] = {}
            for (link_type, link_values) in iteritems(links):
                d['links'][link_type] = link_values.get(block, [])
            diskname = os.path.basename(sysdir)
            for key in ['vendor', 'model', 'sas_address', 'sas_device_handle']:
                d[key] = get_file_content(sysdir + "/device/" + key)