Report name/uuid and agent connected tokens support.

Geoffrey McRae requested to merge geoff/spice:geoff-master-patch-37804 into master

A well behaved client implementing the SPICE protocol should check to see if the server supports the capabilities it needs. This implementation of the spice-server supports SPICE_MAIN_CAP_NAME_AND_UUID and SPICE_MAIN_CAP_AGENT_CONNECTED_TOKENS so it should report this to the client.

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