Support netplan for network configuration

Ubuntu 20.x uses netplan now. So need to update to make this work for the new LTS.

assigned to @agent_kith

moved from snakeoil-rest#188 (moved)

changed milestone to %99.0.0

changed milestone to %1.2.4 (Gear Isolation U4)

changed milestone to %1.3.0 (Measurements)

changed milestone to %1.2.6 (Gear Isolation U6)

created branch 21-support-netplan-for-network-configuration to address this issue

Adding new dependency yaml-cpp

Refer here for some netplan examples

mentioned in commit cf480055

mentioned in commit 55fe6893

mentioned in commit 1374ae14

mentioned in commit 296b829b

mentioned in commit 43803acc

mentioned in commit cf618669

mentioned in merge request !51 (merged)

closed with commit 8d421ad0

mentioned in commit 8d421ad0