jailparam_add
static void jailparam_add(const char *name, const char *val);
jailparam_add("persist", "true");
jailparam_add("allow.mount", "true");
jailparam_add("allow.mount.devfs", "true");
jailparam_add("enforce_statfs", "1");
jailparam_add("host.hostname", bootenv);
jailparam_add("path", mnt_loc);
jailparam_add(name, val);