Add option for disable agent config plugins

[mo36924]

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Description

Some plugins are enabled by default and are installed during provisioning. In most cases, you don't need to enable the plugin when you create an image, so set the option to disable the plugin for the cloud agent.

agent config option https://docs.oracle.com/en-us/iaas/tools/go/65.6.0/core/index.html#LaunchInstanceDetails

[VAdamec]

Workaround for now (sample only)

provisioner "shell-local"{
        environment_vars = ["INSTANCE_ID=${build.ID}"]
        execute_command = ["sh", "-c", "{{.Vars}} {{.Script}}"]
        scripts = ["script/bugfixer.sh"]
    }

and

# script/bugfixer.sh
oci compute instance update --region=${REGION} \
--agent-config \
'{"are_all_plugins_disabled": "false", "is_management_disabled": "true", "is_monitoring_disabled": "false","plugins_config":[{"name": "Block Volume Management", "desired_state": "ENABLED", "name": "Custom Logs Monitoring", "desired_state": "DISABLED"}]}' \
--force --instance-id ${INSTANCE_ID}