Add cpu affinity option to supervised node config

src/zeek-affinity.h

@@ -0,0 +1,15 @@
+// See the file "COPYING" in the main distribution directory for copyright.
+
+namespace zeek {
+
+/**
+ * Set the process affinity to a given CPU.  Currently only supported on
+ * Linux and FreeBSD.
+ * @param core_number  the core to which this process should set its affinity.
+ * Cores are typically numbered 0..N.
+ * @return true if the affinity is successfully set and false if not with
+ * errno additionally being set to indicate the reason.
+ */
+bool set_affinity(int core_number);
+
+} // namespace zeek