[Format/C++/Java] Remove VectorLayout metadata from Flatbuffers metadata

[asfimport]

Based on the discussions on the mailing list, we should remove the VectorLayout metadata from the Flatbuffers spec for 0.8.0 since we are already breaking the metadata. We should instead make the buffer layouts an immutable part of the format specification so there is no ambiguity about what buffers accompany each type of field in an Arrow payload

see also ARROW-1693

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• [JS] Error reading dictionary-encoded integration test files (relates to)

PRs and other links:

• GitHub Pull Request #1297

_{Note: This issue was originally created as ARROW-1785. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 1297
#1297