Add network static gateway configuration support

This commit enables static gateway configuration on EthernetInterface
Implements CreateStaticGateway method which creates a new d-bus object
with Sta

Add network static gateway configuration support

This commit enables static gateway configuration on EthernetInterface
Implements CreateStaticGateway method which creates a new d-bus object
with StaticGateway interface.

Tested By:
Run StaticGateway D-bus method and verified D-bus object and
configuration.
Delete StaticGateway object
Add static gateway
Delete static gateway

Change-Id: I3fbc6f85ede00b6c1949a0ac85f501037a69c831
Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>

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