More janitorial work

Install vpp api header files in /usr/include/vpp-api, instead of
/usr/include/api. Someone will eventually complain if we continue with
the status quo.

Generate /usr/bin/vpp_plugin_configure, to correctly configure
standalone plugin compilation against header files installed from the
dev package.

If a plugin's CFLAGS don't precisely match the installed vpp engine
binary, subtle misbehavior can and will occur. Example: the ip4/ip6
main_t structure size / member offsets depend on DPDK=[0|1]. Screw
that one up, and your brand-new configurable ip feature will
mysteriously fail to appear, even though the plugin loads perfectly.

Change-Id: I20c97fe1042808a79935863209d995c31953b98c
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/vpp-api/python/Makefile.am b/vpp-api/python/Makefile.am
index b96ff3d..4d2d221 100644
--- a/vpp-api/python/Makefile.am
+++ b/vpp-api/python/Makefile.am
@@ -33,11 +33,11 @@
 
 BUILT_SOURCES += vpp_papi.py
 
-vpp_papi.py: $(prefix)/../vpp/api/vpe.api pneum/api-gen.py
+vpp_papi.py: $(prefix)/../vpp/vpp-api/vpe.api pneum/api-gen.py
 	@echo "  PYTHON API";                                            	  \
 	$(CC) $(CPPFLAGS) -E -P -C -x c $<			                  \
 	| vppapigen --input - --python defs_$@;                                   \
-	echo "#include <api/vpe_msg_enum.h>"                                      \
+	echo "#include <vpp-api/vpe_msg_enum.h>"                                      \
 	| $(CC) $(CPPFLAGS) -E -P -x c - | grep VL_API                            \
 	| @srcdir@/pneum/api-gen.py -i defs_$@ > @srcdir@/vpp_papi/$@
 
diff --git a/vpp-api/python/pneum/pneum.c b/vpp-api/python/pneum/pneum.c
index 971c79b..ac51849 100644
--- a/vpp-api/python/pneum/pneum.c
+++ b/vpp-api/python/pneum/pneum.c
@@ -31,16 +31,16 @@
 #include <vlibapi/api.h>
 #include <vlibmemory/api.h>
 
-#include <api/vpe_msg_enum.h>
+#include <vpp-api/vpe_msg_enum.h>
 
 #include "pneum.h"
 
 #define vl_typedefs             /* define message structures */
-#include <api/vpe_all_api_h.h> 
+#include <vpp-api/vpe_all_api_h.h> 
 #undef vl_typedefs
 
 #define vl_endianfun             /* define message structures */
-#include <api/vpe_all_api_h.h> 
+#include <vpp-api/vpe_all_api_h.h> 
 #undef vl_endianfun
 
 typedef struct {
@@ -63,7 +63,7 @@
 }
 
 #define vl_api_version(n,v) static u32 vpe_api_version = v;
-#include <api/vpe.api.h>
+#include <vpp-api/vpe.api.h>
 #undef vl_api_version
 void
 vl_client_add_api_signatures (vl_api_memclnt_create_t *mp)
diff --git a/vpp-api/python/pneum/test_pneum.c b/vpp-api/python/pneum/test_pneum.c
index 18627b3..b313195 100644
--- a/vpp-api/python/pneum/test_pneum.c
+++ b/vpp-api/python/pneum/test_pneum.c
@@ -36,13 +36,13 @@
 #include <vlibmemory/api.h>
 #include <vnet/ip/ip.h>
 
-#include <api/vpe_msg_enum.h>
+#include <vpp-api/vpe_msg_enum.h>
 #include <signal.h>
 #include <setjmp.h>
 #include "pneum.h"
 
 #define vl_typedefs             /* define message structures */
-#include <api/vpe_all_api_h.h> 
+#include <vpp-api/vpe_all_api_h.h> 
 #undef vl_typedefs
 
 volatile int sigterm_received = 0;