switched to using ULocale.builder and added test to check that utf8_bin now throws an unsupported collation exception
now accepts variants
now accepts variants
removed some incorrect checks
remove duplicate test
merge hchandl: Accept collation variants, improve collation validation

Merge pull request #1448 from hchandl/sql-layer/moreCollation
https://github.com/FoundationDB/sql-layer/pull/1448