to set new power environment if power environment was already initialized.
In this case the function will return -1 unless the environment is unset first
(using ``rte_power_unset_env``). Other function usage scenarios will not change.
+
+* mempool: starting from v20.11, rte_mempool_populate_iova() will
+ return -ENOBUFS instead of -EINVAL when there is not enough room to
+ store one object.