Add failing tests to FromStr for Region
Add failing tests to FromStr for Region

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