Added support SAP_VENDOR_ENABLED for DateTimeOffset

[AlapanGhosh]

Added support to switch between generic and SAP OData implementation for the EDMtype DateTimeOffset.

This is an extension to #106

Further reading: https://blogs.sap.com/2017/01/05/date-and-time-in-sap-gateway-foundation/

[phanak-sap]

btw, just for an info, latest version pf pyodata wil have fix for DateTimeOffset - relevant to timezones. Our odata services (sap gateway) returns everything in UTC, so far it was not a problem.

But worth looking into the timezone part in generator.py - as separate issue, since depends on version bump.

https://github.com/SAP/python-pyodata/pull/184

[AlapanGhosh]

btw, just for an info, latest version pf pyodata wil have fix for DateTimeOffset - relevant to timezones. Our odata services (sap gateway) returns everything in UTC, so far it was not a problem.

But worth looking into the timezone part in generator.py - as separate issue, since depends on version bump.

SAP/python-pyodata#184

@phanak-sap from what I understood, the timezone details would be a separate property of the DateTimeOffset object with the new update. Since we are generating the timezone offset in generator itself, I dont think this adds a constraint on ODFuzz.

[codecov-commenter]

Codecov Report

Merging #110 (b8ce4d8) into master (b11aab0) will decrease coverage by 0.24%. The diff coverage is 25.71%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   62.17%   61.92%   -0.25%     
==========================================
  Files          19       19              
  Lines        3630     3651      +21     
==========================================
+ Hits         2257     2261       +4     
- Misses       1373     1390      +17     

Impacted Files	Coverage Δ
odfuzz/generators.py	65.38% <25.71%> (-4.57%)	:arrow_down:

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[phanak-sap]

Is this ready for review or still a Draft?

[phanak-sap]

Looks good, thx for the fix.