Align type for command_id and request_id

[dlemire60]

Issue #388 asked for format specifications for Command-ID, among others. This was addressed in PR #431.

• In 3.3.1, OpenC2 Command, command_id is type Command-ID
• PR #431 Updated the Command-ID definition in 3.4.2.2 with description and usage requirement:
  • Description: Included in a Command message by an OpenC2 Producer to enable future references to the specific command. OpenC2 Consumers can include the command_id from the Command message in Reponses to specify the Command to which the Response corresponds.
  • Usage: Value SHOULD be a string representation of a UUIDv4 as defined in RFC4122
• In 3.2, Message
  • the request_id element is described as “A unique identifier created by the Producer and copied by Consumer into all Responses, in order to support reference to a particular Command, transaction, or event”
  • and has a usage requirements:
    • The request_id of a Message SHOULD be a Version 4 UUID as specified in RFC4122
    • A Consumer MUST copy the request_id from the Message header of a Command into each Response to that Command

Based on these similarities, request_id should be defined as type Command-ID in Table 3-1, Common Message Elements, and the Type: Headers table later in that section for consistency

[dlemire60]

PR #437 has been merged. Closing this issue.