fixing RMR messages with negative size

This fixes an issue in RMR when receiving messages that in their
header have a negative length. We now mark the connection
as to be reset, i.e, it becomes unusable once there was a
message sent with a wrong header length.

Issue-ID: RIC-989

Change-Id: I1e6e958d1f3977b2caf15477d8381aeda3c77822
Signed-off-by: czichy <thoralf.czichy@nokia.com>
6 files changed