Replace most uses of assert by ovs_assert.

This is a straight search-and-replace, except that I also removed #include
<assert.h> from each file where there were no assert calls left.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>

lib/random.c

@@ -17,7 +17,6 @@
 #include <config.h>
 #include "random.h"
 
-#include <assert.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <sys/time.h>
@@ -59,7 +58,7 @@ random_init(void)
 void
 random_set_seed(uint32_t seed_)
 {
-    assert(seed_);
+    ovs_assert(seed_);
     seed = seed_;
 }