Add Schemata::DEA::DiscoverRequest

Change-Id: I2dff8cbae8444c6281f1a0bb7e8352ccf0ef35c6
Add Schemata::DEA::UpdateRequest

Change-Id: I9bd82affc19e101f8635e839be6db77de58092b8
Add Schemata::DEA::FindDropletRequest

Change-Id: I27bbbb87515bc4b8ed9761d1c255ffe44ce6abff
Add Schemata::DEA::FindDropletResponse

Change-Id: Icc481e2f57b8ac95c95a67822c98e3d6ad15b68b
Add Schemata::DEA::DropletStatusResponse

Change-Id: I4ed32ef1413d3514f742662f7d0f0b11d374f457
Add Schemata::DEA::AdvertiseMessage

Change-Id: I23de5ec82660c1d208fb392e676156cea1911a99