[python] Remove unneeded attrs in get_mrenclave_and_manifest()

[dimakuv]

Description of the changes

The only enclave attributes required for the SGX enclave measurement are the enclave size and the number of enclave threads. Other attributes such as ISV_PROD_ID, ISV_SVN, XFRM are not included in the measurement.

This commit is extracted from #881.

How to test this PR?

E.g., manually build the Helloworld example.

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This change is 

[kailun-qin]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion, not enough approvals from maintainers (2 more required), not enough approvals from different teams (1 more required, approved so far: Intel) (waiting on @dimakuv)

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-- commits line 5 at r1:
What about edmm_enable then?

Code quote:

  The only enclave attributes required for the SGX enclave measurement are
  the enclave size and the number of enclave threads. Other attributes

[dimakuv]

Reviewable status: all files reviewed, 1 unresolved discussion, not enough approvals from maintainers (2 more required), not enough approvals from different teams (1 more required, approved so far: Intel) (waiting on @kailun-qin)

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-- commits line 5 at r1:

Previously, kailun-qin (Kailun Qin) wrote…

What about edmm_enable then?

Done, forgot to add in the text.

For those curious: enabling EDMM modifies what enclave pages are EADDed to the initial enclave image, and thus the EDMM option modifies the SGX enclave measurement (MRENCLAVE). So it is considered as one of the factors.

[kailun-qin]

Reviewed all commit messages.
Reviewable status: all files reviewed, all discussions resolved, not enough approvals from maintainers (1 more required), not enough approvals from different teams (1 more required, approved so far: Intel)

[mkow]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[kailun-qin]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved