redhat: docs: add waagent manpage (RHEL-9) (#3401)

Li Tianrequested to merge
litian1/WALinuxAgent:c9s into c9s

Jira: https://issues.redhat.com/browse/RHEL-109496

Add a man page for waagent and its handler in setup.py.

Upstream PR: https://github.com/Azure/WALinuxAgent/pull/3401

Signed-off-by: Li Tian litian@redhat.com

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