message: Add Key Vault team members to CODEOWNERS
diff: /specification/insights/ @gucalder
  /specification/intune/ @vrmurthy01
  /specification/iothub/ @rkmanda
  -/specification/keyvault/ @schaabs @heaths
  +/specification/keyvault/ @heaths @randallilama @jlichwa
  /specification/logic/ @pankajsn @tonytang-microsoft-com
  /specification/machinelearning/ @nonstatic2014
  /specification/machinelearningcompute/ @shutchings
  