QemuHCK: Ensure to kill swtpm

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>

lib/setupmanagers/qemuhck/devices/tpm-tis.json

@@ -6,6 +6,7 @@
     "-device tpm-tis,tpmdev=tpm0"
   ],
   "define_variables": {
+    "@tpm_pid@": "@workspace@/swtpm_@run_id@_@client_id@.pid",
     "@tpm_state_dir@": "@workspace@/swtpm_state_@run_id@_@client_id@",
     "@tpm_socket@": "/tmp/swtpm_@run_id@_@client_id@_sock"
   },
@@ -15,6 +16,9 @@
   ],
   "pre_start_commands": [
     "rm -f @tpm_socket@",
-    "swtpm socket --daemon --tpm2 --tpmstate dir=@tpm_state_dir@ --ctrl type=unixio,path=@tpm_socket@ --log file=@tpm_state_dir@/swtpm.log,level=20"
+    "swtpm socket --daemon --pid file=@tpm_pid@ --tpm2 --tpmstate dir=@tpm_state_dir@ --ctrl type=unixio,path=@tpm_socket@ --log file=@tpm_state_dir@/swtpm.log,level=20"
+  ],
+  "post_stop_commands": [
+    "kill $(cat @tpm_pid@) || true"
   ]
 }