tests: Fixing incomplete atf_skip if missing jail condition

Testing the scripts outside kyua(1) was a bad idea:
It didn't allow me to detect that they were faulty.

Sponsored by:	Netflix

bin/hostname/tests/hostname_test.sh

@@ -81,6 +81,9 @@ basic_body()
 }
 basic_cleanup()
 {
+    if ! which -s jail; then
+        atf_skip "This test requires jail"
+    fi
     recycle
 }
 

sys/kern/sysctl_security_jail_children.sh

@@ -33,12 +33,12 @@ max_cur_head()
 {
 	atf_set descr 'Test maximum and current number of child jails'
 	atf_set require.user root
-	if ! which -s jail; then
-		atf_skip "This test requires jail"
-	fi
 }
 max_cur_body()
 {
+	if ! which -s jail; then
+		atf_skip "This test requires jail"
+	fi
 	origin_max=$(sysctl -n security.jail.children.max)
 	origin_cur=$(sysctl -n security.jail.children.cur)