seccomp: adding sysinfo system call to whitelist

Newer version of nss-softokn libraries (> 3.16.2.3) use sysinfo call
so qemu using rbd image hang after start when run in sandbox mode.

To allow using rbd images in sandbox mode we have to whitelist it.
Signed-off-by: NMiroslav Rezanina <mrezanin@redhat.com>
Acked-by: NEduardo Otubo <eduardo.otubo@profitbricks.com>

qemu-seccomp.c

@@ -252,6 +252,7 @@ static const struct QemuSeccompSyscall seccomp_whitelist[] = {
 #ifdef HAVE_CACHEFLUSH
     { SCMP_SYS(cacheflush), 240 },
 #endif
+    { SCMP_SYS(sysinfo), 240 },
 };
 
 int seccomp_start(void)