sia: use hostname -f if os.Hostname does not return fqdn #2128
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the instance owner has the option to enable sandns_hostname flag in SIA (e.g. AWS, GCP) to include the instance's hostname in the identity certificate. SIA uses os.Hostname() api but that sometimes does not return fqdn and golang does not provide an option to force the -f flag. So if the sandns_hostname option is enabled, sia will call os.Hostname() first and it does not get a fqdn, it tries "/bin/hostname -f" to see if it gets one.