ePump v2.1.6 released
- Fixed the bugs that ioevents can not be generated in select mode;
- Fixed the bugs: eventfd was not added monitor list correctly, FDSET in select mode;
- incorrectly getting min node from device rbtree caused incorrect handling of event dispatching in select mode;
- added one interface: appending DNS name server to epcore_t core object, for facilitating to adopt user-given DNS;