Rebase our custom NetworkManager package on top of 1.6.2-3+deb9u2

Originally created by @intrigeri on #16365 (Redmine)

Tails 3.11 has 1.6.2-3+0.tails1, current devel branch has 1.6.2-3+deb9u2. Presumably we need to rebase our custom package.

Feature Branch: bugfix/16365-update-network-manager

Edited May 15, 2020 by intrigeri

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