Set password for the specified user.
bool nm_iam_state_user_set_password(struct nm_iam_user* user, const char* password)
- [in] the username of the user
- [in] the password to set for the user
NM_IAM_ERROR_OK: if password was set successfully for the user.
NM_IAM_ERROR_NO_SUCH_USER: if the specified user does not exist.