It was only 'sha1' algorithm being used till now in ``hash_file``
method to create hash of the file contents. Need to add 'md5'
to keep the consistency with that of IPA code base. Also, this
method now supports all the algorithms hashlib does. As this
method wasn't being used at all, therefore making the default
algorithm to 'md5'. Will be used in oob firmware update (manual
clean step) to verify the checksum of the images.
Change-Id: I8159fd64d1c074bd539817a40900e34f8fae30d4
1de89030a7