[Feature][ZK-107] remove connman, add default route manage script and
control api (part 2)

Affected branch: ZK-first-oem-release
Affected module: network management
Is it affected on both ZXIC and MTK: mtk
Self-test: Yes
Doc Update: No

Change-Id: I0163168ab6f4f94fc1fc210b256ab22df0dae981
7 files changed