unit test cases for common/utils
unit test cases for common/utils

functions: ExcludeUint64, RemoveUint16, RemoveString, HasUint64
- Addressing a minor typo
- For common/utils.go
- tests for non-overlapping set and non-existing members
- Go test passing

Change-Id: I1892d3dcff996a1f7000dbb49f4d6bca3f110f7d

jchris/indexing,jchris/indexing,jchris/indexing,jchris/indexing