cadc-storage-adapter-swift: remove hard-coded assumption of md5 file checksum #387
Description
The model expresses checksums as {algorithm}:{hex value)
cadc-storage-adapter MessageDigestAPI supports md5, sha1, sha224, sha256, and sha512
SwiftStorageAdapter config should allow config of
defaultChecksumAlgorithm={supported algorithm}
enforceSingleChecksumAlgorithm=true|false
The code should never assume md5.