MultiImporter warnings for duplicates due to root importer

[muuki88]

Since our upgrade to 21.2.0 we see hundreds of warnings due to Expected to find just 1 match for <... thrift file name... >.

We have multi module setups and this line is responsible for the new warnings.

scrooge/scrooge-generator/src/main/scala/com/twitter/scrooge/Compiler.scala

Line 48 in 1c26f6c

val importer = Importer(new File(".")) +: Importer(config.includePaths.toSeq)

The root directory ( new File(".") ) is always added as an importer, which in multi module scenarios means that the every file can be found twice.

root/
  api/
    src/main/thrift/services.thrift

Produces the following warning

WARN: Expected to find just 1 match for /root/api/src/main/thrift/services.thrift, but found 2, in DirImporter(/root), DirImporter(/root/api/src/main/thrift/)

[muuki88]

Sorry, just saw #341