Premigration fails with generated fmspc policy - TlsStream error

[mpojmaj]

Describe the bug

Premigration fails with generated fmspc policy - TlsStream error

To Reproduce

1. cd tools/migtd-policy-generator
2. cargo build
3. cd ../../
4. ./target/debug/migtd-policy-generator -o config/policy_pre_production_fmspc_tool.json --pre-production
5. bash sh_script/preparation.sh
6. cargo image --policy config/policy_pre_production_fmspc_tool.json --root-ca config/Intel_SGX_Provisioning_Certification_RootCA_preproduction.cer
7. cd sh_script/test
8. sudo pytest -k "pre_migration" --servtd_hash $(cargo hash --image /root/MigTD/target/release/migtd.bin)

Expected behavior
Premigration should be successful.

Additional context
It works with policy_pre_production_fmspc.json located in repository.