Add support for SCMP_ACT_KILL_THREAD

The seccomp action has been added to libseccomp a while ago, so I guess
the runtime spec should support it as well:

seccomp/libseccomp@b2f15f3

Signed-off-by: Sascha Grunert <sgrunert@suse.com>

Author: saschagrunert

config-linux.md

@@ -637,6 +637,7 @@ The following parameters can be specified to set up seccomp:
 
         * `SCMP_ACT_KILL`
         * `SCMP_ACT_KILL_PROCESS`
+        * `SCMP_ACT_KILL_THREAD`
         * `SCMP_ACT_TRAP`
         * `SCMP_ACT_ERRNO`
         * `SCMP_ACT_TRACE`

schema/defs-linux.json

@@ -56,6 +56,7 @@
             "enum": [
                 "SCMP_ACT_KILL",
                 "SCMP_ACT_KILL_PROCESS",
+                "SCMP_ACT_KILL_THREAD",
                 "SCMP_ACT_TRAP",
                 "SCMP_ACT_ERRNO",
                 "SCMP_ACT_TRACE",

specs-go/config.go

@@ -641,6 +641,7 @@ type LinuxSeccompAction string
 const (
 	ActKill        LinuxSeccompAction = "SCMP_ACT_KILL"
 	ActKillProcess LinuxSeccompAction = "SCMP_ACT_KILL_PROCESS"
+	ActKillThread  LinuxSeccompAction = "SCMP_ACT_KILL_THREAD"
 	ActTrap        LinuxSeccompAction = "SCMP_ACT_TRAP"
 	ActErrno       LinuxSeccompAction = "SCMP_ACT_ERRNO"
 	ActTrace       LinuxSeccompAction = "SCMP_ACT_TRACE"