Unifies region_in_aws_format returns in matcher.
Unifies region_in_aws_format returns in matcher.

mattico/rusoto,DualSpark/rust-aws,matthewkmayer/rust-aws,matthewkmayer/rust-aws,matthewkmayer/rust-aws,noggleboggle/rusoto,mthjones/rusoto,mthjones/rusoto,ford-prefect/rusoto,mattico/rusoto,rusoto/rusoto,SecurityInsanity/rusoto,DualSpark/rust-aws,indiv0/rusoto,mattico/rusoto,ford-prefect/rusoto,rusoto/rusoto,DualSpark/rusoto,DualSpark/rusoto,rusoto/rusoto,cmsd2/rusoto,DualSpark/rust-aws,DualSpark/rusoto,SecurityInsanity/rusoto