Integration tests write attributes

[mgdlkundera]

Following tests:

• test about epmin, epmax,
• test about pmin = pmax,
• test where we use several attribute together,
• test to be sure that attribute inheritance works.

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[sbernard31]

(I edited the PR to target branch write_attributes instead of master)

[sbernard31]

I advice you to read specifications (see https://github.com/eclipse-leshan/leshan/issues/534#issue-341031759) (maybe this is already done :grin:)

I guess it should help to identify how attributes should interact with each other and so which kind of combination makes sense to test. :slightly_smiling_face:

[sbernard31]

(Also keep in mind that current implement doesn't probably implement expected behavior. So do not write tests in function of current code behavior :slightly_smiling_face:)

[sbernard31]

I rebase this work on writes_attributes branch and it is now integrated in this branch.

[sbernard31]

(see PR #1514)