Currently the old encrypted keys may not match the path component encoding. Change the iterator such that the prefixes handle arbitrary byte sequences. Change-Id: I0a50049f4ef9887e1c4df6f9692f967a054430eb
Rename iterator tests to iterator_test.go. Add Delimiter to metabase package. Change-Id: Icea6542b54176d716daba4afad901713f1dcac90