Use Java NIO as fallback for Netty when epoll is not available

[emerkle826]

Issue:

Management API was developed to run on Linux. It takes advantage of this for its Netty usage by essentially requiring epoll for the event queue. This makes fully testing Management API difficult for Mac users.

Definition of Done

• It should be possible to detect the absence of epoll and fall back to using Java's NIO.
• If Management API is run and falls back to Java NIO, a warning should be logged indicating the degraded performance and that the condition should only be acceptable in labs/development/testing/etc.

┆Issue is synchronized with this Jira Story by Unito
┆Issue Number: MAPI-16