Support Pagination in TAXII DataStore

[emmanvg]

Proposed solution to solve the pagination issues.

Closes #479

[codecov-io]

Codecov Report

Merging #480 (76eebeb) into master (0866df0) will decrease coverage by 0.01%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master     #480      +/-   ##
==========================================
- Coverage   89.32%   89.31%   -0.02%     
==========================================
  Files         144      144              
  Lines       16020    16034      +14     
==========================================
+ Hits        14310    14320      +10     
- Misses       1710     1714       +4     

Impacted Files	Coverage Δ
stix2/datastore/taxii.py	69.23% <61.53%> (-0.52%)	⬇️
stix2/test/v20/test_datastore_taxii.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0866df0...76eebeb. Read the comment docs.

[chisholm]

Just curious: would it make sense to add an as_pages() function for the 2.1 TAXII client, similar to the 2.0 client? It could be a nice convenience for 2.1 users and better align their APIs.

[emmanvg]

I think so, that was one of my observations when making the changes. The second one being that some TAXII 2.0 Servers that claim pagination support are not providing the headers required to continue asking for pages making the client code to not behave with consistency.

[clenk]

LGTM; thanks @emmanvg!