Adding support for WCOW UVM log forward service

[marma-dev]

Adding support to manage control plane operations and receive the log data from the Log Forward Service in the Utility VM.

Control Plane: Based on annotations passed for WCOW pod creation HcsShim sends commands via the bridge to the GCS which relays this by calling appropriate RPCs of the Log Forward Service.
Data Plane: HcsShim creates a HvSocket listener to receive the logs from the Log Forward Service, parses them and re-logs it to the RunHCS ETW provider

Control Plane

During protocol negotiation, inbox GCS shall exhibit a new GcsCapabilities called ModifyServiceSettingsSupported indicating GCS supports ModifyServiceSettings. Also, GuestDefinedCapabilites for WCOW shall mention LogForwardingSupported indicating Log Forward Service is present

For Control Plane ops, a new message category ComputeService and message type ModifyServiceSettings is added (following pattern of HCS ModifyServiceSettings). The Settings property of the ModifyServiceSettings shall mention the name of service (Log Forward Service for our case), with details of the operation to be called for it (e.g. Modify, Start, Stop). Existing hex interpreting logic to determine type of message had to be modified as they were hardcoded to only expect ComputeSystem category of messages.

Annotations for WCOW UVM Create are added

Name	Annotation	Description
LogSources	io.microsoft.virtualmachine.wcow.logsources	Base64 encoded JSON containing Log Sources
ForwardLogs	io.microsoft.virtualmachine.wcow.forwardlogs	Master Switch for whether to forward logs or not

By default, ForwardLogs would be true for WCOW and false for C-WCOW, unless specified

Data Plane

HcsShim creates the HvSocket Listener to listen for connections from the Log Forward Service. This is created irrespectively, as we plan to allow Log Forward Service to connect after UVM creation is done as well, by (later in a different PR) introduce support for enabling the ForwardLogs as part of Update call.

The HvSocket is also created to limit only one concurrent connection at a time, and allow for reconnection (and not close the listener on accept)

On accepting the connection, the output is handled by ParseLogrus which has been modified to expect the message to be in message or Message which is typical in Windows ETW events

[marma-dev]

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[KenGordon]

We have some annoyances from poor choices using .lcow. in annotations for C-LCOW. Maybe we should not use .wcow. here so that the day we can do this for linux we don't end up with two annotations, two lots of consuming code etc etc.