swtpm: Advertise --migration option in capabilities JSON

Advertise the capability of supporting the --migration option
in the capabilies JSON that now has the cmdarg-migration verb:

$ swtpm socket --print-capabilities | jq
{
  "type": "swtpm",
  "features": [
    "tpm-1.2",
    "tpm-2.0",
    "tpm-send-command-header",
    "flags-opt-startup",
    "flags-opt-disable-auto-shutdown",
    "cmdarg-seccomp",
    "cmdarg-key-fd",
    "cmdarg-pwd-fd",
    "cmdarg-print-states",
    "cmdarg-migration",
    "nvram-backend-dir",
    "nvram-backend-file"
  ],
  "version": "0.8.0"
}

Adjust test cases and extend man page.

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