Deshim VirtualExecutor in folly
Summary:
The following rules were deshimmed:
```
//folly:virtual_executor -> //folly/executors:virtual_executor
```
The following headers were deshimmed:
```
folly/VirtualExecutor.h -> folly/executors/VirtualExecutor.h
```
This is a codemod. It was automatically generated and will be landed once it is approved and tests are passing in sandcastle.
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Reviewed By: Orvid
Differential Revision:
D57217665
fbshipit-source-id:
46888473f82ce08f284864778d13d5fdf426b8d2