[sonic boot] disable dhcp during boot up, until updategraph service is running #2316
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- What I did
A freshly installed sonic image could take 65 more seconds to boot up, waiting for dhcp offer on the management port if there is no dhcp server to send an offer.
That could add 65 seconds of delay during warm boot or fast boot. Either case, it delays the returning of the control plane.
This change delays enabling management port dhcp request until the updategraph service is running and dhcp is enabled.