Change assert_* to expect_* in tests

```
grep -Irl assert_ test/ | xargs sed -i \
    's/witness_assert/witness_do_not_replace/g';
grep -Irl assert_ test/ | xargs sed -i \
    's/malloc_mutex_assert_owner/malloc_mutex_do_not_replace_owner/g';

grep -Ir assert_ test/ | grep -o "[_a-zA-Z]*assert_[_a-zA-Z]*" | \
    grep -v "^assert_"; # confirm no output
grep -Irl assert_ test/ | xargs sed -i 's/assert_/expect_/g';

grep -Irl witness_do_not_replace test/ | xargs sed -i \
    's/witness_do_not_replace/witness_assert/g';
grep -Irl malloc_mutex_do_not_replace_owner test/ | xargs sed -i \
    's/malloc_mutex_do_not_replace_owner/malloc_mutex_assert_owner/g';
```

test/integration/allocated.c

@@ -32,7 +32,7 @@ thd_start(void *arg) {
 		test_fail("%s(): Error in mallctl(): %s", __func__,
 		    strerror(err));
 	}
-	assert_u64_eq(*ap0, a0,
+	expect_u64_eq(*ap0, a0,
 	    "\"thread.allocatedp\" should provide a pointer to internal "
 	    "storage");
 
@@ -53,25 +53,25 @@ thd_start(void *arg) {
 		test_fail("%s(): Error in mallctl(): %s", __func__,
 		    strerror(err));
 	}
-	assert_u64_eq(*dp0, d0,
+	expect_u64_eq(*dp0, d0,
 	    "\"thread.deallocatedp\" should provide a pointer to internal "
 	    "storage");
 
 	p = malloc(1);
-	assert_ptr_not_null(p, "Unexpected malloc() error");
+	expect_ptr_not_null(p, "Unexpected malloc() error");
 
 	sz = sizeof(a1);
 	mallctl("thread.allocated", (void *)&a1, &sz, NULL, 0);
 	sz = sizeof(ap1);
 	mallctl("thread.allocatedp", (void *)&ap1, &sz, NULL, 0);
-	assert_u64_eq(*ap1, a1,
+	expect_u64_eq(*ap1, a1,
 	    "Dereferenced \"thread.allocatedp\" value should equal "
 	    "\"thread.allocated\" value");
-	assert_ptr_eq(ap0, ap1,
+	expect_ptr_eq(ap0, ap1,
 	    "Pointer returned by \"thread.allocatedp\" should not change");
 
 	usize = malloc_usable_size(p);
-	assert_u64_le(a0 + usize, a1,
+	expect_u64_le(a0 + usize, a1,
 	    "Allocated memory counter should increase by at least the amount "
 	    "explicitly allocated");
 
@@ -81,19 +81,19 @@ thd_start(void *arg) {
 	mallctl("thread.deallocated", (void *)&d1, &sz, NULL, 0);
 	sz = sizeof(dp1);
 	mallctl("thread.deallocatedp", (void *)&dp1, &sz, NULL, 0);
-	assert_u64_eq(*dp1, d1,
+	expect_u64_eq(*dp1, d1,
 	    "Dereferenced \"thread.deallocatedp\" value should equal "
 	    "\"thread.deallocated\" value");
-	assert_ptr_eq(dp0, dp1,
+	expect_ptr_eq(dp0, dp1,
 	    "Pointer returned by \"thread.deallocatedp\" should not change");
 
-	assert_u64_le(d0 + usize, d1,
+	expect_u64_le(d0 + usize, d1,
 	    "Deallocated memory counter should increase by at least the amount "
 	    "explicitly deallocated");
 
 	return NULL;
 label_ENOENT:
-	assert_false(config_stats,
+	expect_false(config_stats,
 	    "ENOENT should only be returned if stats are disabled");
 	test_skip("\"thread.allocated\" mallctl not available");
 	return NULL;