compel plugins uapi: rename includes

The statement like

	#include <compel/plugins/plugin-std.h>

looks a bit tautological. I think the single "plugins" word is enough:

	#include <compel/plugins/std.h>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/plugins/shmem/shmem.c

 #include <sys/mman.h>
 
 #include <compel/plugins.h>
-#include <compel/plugins/plugin-shmem.h>
+#include <compel/plugins/shmem.h>
 #include <compel/plugins/std/syscall.h>
 #include "shmem.h"
 #include "std-priv.h"

compel/plugins/std/fds.c

 #include <errno.h>
 
 #include <compel/plugins.h>
-#include <compel/plugins/plugin-std.h>
+#include <compel/plugins/std.h>
 
 #include "std-priv.h"
 

compel/plugins/std/infect.c

-#include <compel/plugins/plugin-std.h>
+#include <compel/plugins/std.h>
 
 #include "common/scm.h"
 #include "common/compiler.h"

compel/plugins/std/std.c

 #include <sys/types.h>
 
 #include <compel/plugins.h>
-#include <compel/plugins/plugin-std.h>
+#include <compel/plugins/std.h>
 
 #include "asm/prologue.h"
 

compel/test/infect/parasite.c

 #include <errno.h>
 
-#include <compel/plugins/plugin-std.h>
+#include <compel/plugins/std.h>
 
 /*
  * Stubs for std compel plugin.