Bump RMR reference in docker file for listener

RMR changs are needed, so we now reference 3.7.4 of RMR.

Issue-ID: RIC334

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I8ffa9e059c8a0815ae3e56a76598d9de82d129a7
4 files changed