nbd: override creds to kernel when calling sock_{send,recv}msg()

Ming Leirequested to merge
minlei/centos-stream-9:rhel9.8-nbd-security-eaccess into main

nbd: override creds to kernel when calling sock_{send,recv}msg()

JIRA: https://issues.redhat.com/browse/RHEL-113752

Signed-off-by: Ming Lei ming.lei@redhat.com

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