Add checksumAlgorithm parameter to determine D1 alg used

[craig-willis]

Problem Repeated registrations of 10.5065/D6862DM8 return different checksum values apparently depending on the D1 server hit.

Solution Add the checksumAlgorithm to the solr query instead of assuming md5.

To test

• Register 10.5065/D6862DM8
• Confirm checksum values are valid for alg used.

[codecov[bot]]

Codecov Report

Merging #524 (95d351d) into master (250f92e) will decrease coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #524      +/-   ##
==========================================
- Coverage   92.88%   92.86%   -0.03%     
==========================================
  Files          58       58              
  Lines        4513     4513              
==========================================
- Hits         4192     4191       -1     
- Misses        321      322       +1     

Impacted Files	Coverage Δ
server/lib/dataone/provider.py	100.00% <ø> (ø)
server/lib/dataone/register.py	76.25% <ø> (ø)
server/lib/dataverse/provider.py	97.09% <0.00%> (-0.42%)	:arrow_down:

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[craig-willis]

Adding notes based on Slack discussion for future reference:

• Solr query may return different algorithms on different nodes https://cn.dataone.org/cn/v2/query/solr/?q=resourceMap:%22resource_map_doi%3A10.5065%2FD6862DM8%22&fl=identifier,formatType,title,size,formatId,fileName,documents,checksum,checksumAlgorithm&rows=1000&start=0&wt=json
• DataONE nodes don't conform to using a single standardized algorithm across deployments https://dataoneorg.github.io/api-documentation/apis/CN_APIs.html#CNCore.listChecksumAlgorithms. This endpoint is most likely in the context of letting users know which algorithms they can checksum their files with when uploading. If none are specified, it's up to the individual node to decide which algorithm to us
• https://cn.dataone.org/cn/v2/checksum returns MD5 and SHA1 today, but above query returns SHA256
• the bottom line is that DataONE does not enforce use of a specific algorithm on any node, and each version of each object can use a different algorithm