Revert "BUG-636: fix PCEP MD5 keys not being propagated"

This reverts commit 7a26709c372ac219be3cc69d35a1b97a6d67b239.

Change-Id: I104ff91826a4320cc253c315e769afc35edf6ecd
Signed-off-by: Robert Varga <rovarga@cisco.com>