vapi: support api clients within vpp process

Add vapi_connect_from_vpp() and vapi_disconnect_from_vpp()
calls to allow API clients from within VPP process.

Add a new memclnt_create version that gives the user a
knob to enable or disable dead client scans (keepalive).

Type: feature
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: Id0b7bb89308db3a3aed2d3fcbedf4e1282dcd03f
Signed-off-by: Ole Troan <ot@cisco.com>
diff --git a/src/vlibapi/api_common.h b/src/vlibapi/api_common.h
index 4c48b00..491ecb8 100644
--- a/src/vlibapi/api_common.h
+++ b/src/vlibapi/api_common.h
@@ -75,6 +75,8 @@
   /* socket client only */
   u32 server_handle;		/**< Socket client only: server handle */
   u32 server_index;		/**< Socket client only: server index */
+
+  bool keepalive; /**< Dead client scan */
 } vl_api_registration_t;
 
 #define VL_API_INVALID_FI ((u32)~0)