Add sigprocmask to default seccomp profile

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

profiles/seccomp/default.json

@@ -314,6 +314,7 @@
 				"sigaltstack",
 				"signalfd",
 				"signalfd4",
+				"sigprocmask",
 				"sigreturn",
 				"socket",
 				"socketcall",

profiles/seccomp/seccomp_default.go

@@ -307,6 +307,7 @@ func DefaultProfile() *types.Seccomp {
 				"sigaltstack",
 				"signalfd",
 				"signalfd4",
+				"sigprocmask",
 				"sigreturn",
 				"socket",
 				"socketcall",