The last test in TestUtilityFunctions() has an incorrect comment.
It states "// ValidateKey should return nil for a valid key"
it should say "// ValidateKey should return error for an invalid key"

Change-Id: Ie7ccf954083d5f3eeb0f879664efb4afb5717b68
Signed-off-by: Chris Elder <chris.elder@us.ibm.com>