TemplateDataBlob: Convert 'clones' to 'inherits'

Before

{
  a: {
    ...,
    clones: ['a2', 'a3']
  },
  a2: {
    some: 'thing'
  },
  a3: {
    other: 'thing'
  }
}

After

{
  a: {
    ...
  },
  a2: {
    inherits: 'a',
    some: 'thing'
  },
  a3: {
    inherits: 'a',
    other: 'thing'
  }
}

Change-Id: Ib17d9e299d503c35e3ee817d3cc4ecb56186b84c
Merge "TemplateDataBlob: Convert 'clones' to 'inherits'"