Fix upgrades that use Management network

Fix upgrades that use Management network

Upgrades from older versions using Management network fail.
This patch enables the management network even though it is not
enabled in any of the role definitions. This will allow upgrades
to complete using existing network environment files, without
requiring operators to switch to the new method for defining
which networks are attached to roles. Eventually these older
environment files will be removed.

Change-Id: Iadd12a559f0ad6918958a1355f189187fd327363
Closes-bug: 1717123
(cherry picked from commit 5b9fbc2b2bfa00de2fe0f437f21e05e3fc09a53d)