BUG-2082: fix TCPMD5 dependency

This installs proper reference to TPCMD5 feature, as provided by
companion patch (*https://git.opendaylight.org/gerrit/#/c/11575/).

Change-Id: I9c475fa2fb5ab58f1e69fdf000866fe345ff4e35
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-2082: fix TCPMD5 dependency" into stable/helium