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swtpm_ioctl: Use timeouts for communicating with swtpm (Unix socket)

Start using timeouts when communicating with swtpm over Unix sockets so
that swtpm_ioctl does not just hang when it cannot communicate with swtpm
such as establishing a connection or reading results. This is because swtpm
listens to nlye one control channel connections.

This patch addresses an aspect of the problem reported in issue #415
but may also starting hiding bugs if certain operations are done in
the wrong order, as was the case in libvirt (6.10 & 7.0).

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

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