vppinfra: minor tweaks for cgo interoperation

'type' is a keyword in golang, so s/type/event_type/ in elog.h and
elsewhere.

Add vec_len_not_inline(...), elog_write_file_not_inline(...) and
elog_read_file_not_inline(...) since the inline forms aren't usable.

More such tweaks may follow.

Type: improvement
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I9a80a6afa635f5cdedee554ee9abe400fafc1cb6
diff --git a/src/vppinfra/vec.h b/src/vppinfra/vec.h
index d4063e6..1fcb5f1 100644
--- a/src/vppinfra/vec.h
+++ b/src/vppinfra/vec.h
@@ -379,6 +379,8 @@
 */
 #define vec_free(V) vec_free_h(V,0)
 
+void vec_free_not_inline (void *v);
+
 /**\brief Free vector user header (syntactic sugar)
    @param h vector header
    @void