Applying the Helium.1 release patch

Also removing the nexusproxy variable from the opendaylight-mirror repo
so that it can find the odlparent release version.

Change-Id: Ib64c3ba36a578fa914c07377bbc6de261b98a531
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>
Signed-off-by: Colin Dixon <colin@colindixon.com>