Further fixes -

- All test files have been renamed to their respective <package>_test name,
    this is done in accordance with
      - https://github.com/golang/go/wiki/CodeReviewComments#import-dot
        imports are largely used in testing, but to avoid namespace collision
        and circular dependencies

  - Never use _* in package names other than "_test" change fragment_v1 to expose
    fragment just like 'gopkg.in/check.v1'

pkg/utils/checksum/crc32c/crc32c_darwin.go

@@ -25,7 +25,7 @@ var castanagoliTable = crc32.MakeTable(crc32.Castagnoli)
 
 /// Convenience functions
 
-// Single caller crc helper
+// Sum32 - single caller crc helper
 func Sum32(buffer []byte) uint32 {
 	crc := crc32.New(castanagoliTable)
 	crc.Reset()
@@ -33,7 +33,7 @@ func Sum32(buffer []byte) uint32 {
 	return crc.Sum32()
 }
 
-// Low memory footprint io.Reader based crc helper
+// Sum - io.Reader based crc helper
 func Sum(reader io.Reader) (uint32, error) {
 	h := New()
 	var err error