zebra: Add a retrieve the mlag role function

Add the ability to retrieve the current role of mlag for this machine.

If mlag is not setup we will always return MLAG_ROLE_NONE.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

zebra/zebra_mlag.c

@@ -25,6 +25,13 @@
 
 #include "zebra/zebra_mlag.h"
 
+enum mlag_role role = MLAG_ROLE_NONE;
+
+enum mlag_role zebra_mlag_get_role(void)
+{
+	return role;
+}
+
 void zebra_mlag_init(void)
 {
 }

zebra/zebra_mlag.h

@@ -26,4 +26,6 @@
 
 void zebra_mlag_init(void);
 void zebra_mlag_terminate(void);
+
+enum mlag_role zebra_mlag_get_role(void);
 #endif