Fix binding to IPv6 interfaces

RMR is unable to bind to IPv6 interfaces causing it to never become
ready when using IPv6-only deployments.

This change fixes this issue and implements application-level test cases
to test support for IPv6 deployments.

Issue-ID: RIC-985

Signed-off-by: Alexandre Huff <alexandrehuff@utfpr.edu.br>
Change-Id: I86b596851cb3561cda34fe20334e285e4151304f
19 files changed