Bug 1875 - Used variables for nexusproxy host, externalized versions

Replaced hardcoded urls to nexus repository with variables.

Change-Id: I168783cd8ffed057ebca030dae04fc682f9cd0af
Signed-off-by: Devin Avery <devin.avery@brocade.com>
Merge "Bug 1875 - Used variables for nexusproxy host, externalized versions"