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Description of problem:
WALA reports "WARNING EnvHandler ExtHandler [hostnamectl set-hostname <hostname> --static] failed, attempting fallback" in waagent.log, which actually run successfully.
The root cause is in azurelinuxagent/common/osutil/redhat.py:
class RedhatOSUtil(Redhat6xOSUtil):
...
    def set_hostname(self, hostname):
...
        if self._run_command_without_raising(hostnamectl_cmd, log_error=False) != 0:
The self._run_command_without_raising function doesn't have return value. Shouldn't get the return value here.

* This issue also exists in upstream.
* No real feature impact

Version-Release number of selected components (if applicable):
WALinuxAgent-2.2.49.2-1.el8.noarch

RHEL Version:
RHEL-8.4.0-20201130.n.1

How reproducible:
100%

Steps to Reproduce:
1. Create a VM on Azure which is provisioned by WALA. Or modify VM hostname and wait for 30s(must disable AutoUpdate or it will use upstream guest agent).
2. Check /var/log/waagent.log

Actual results:
There's a warning log in waagent.log, e.g.
WARNING EnvHandler ExtHandler [hostnamectl set-hostname walacheck2 --static] failed, attempting fallback

Expected results:
Shouldn't have such log

Additional info:
- N/A

Upstream patch: https://github.com/Azure/WALinuxAgent/pull/2093

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (WALinuxAgent bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1855