Fix packages rebuild every time

[mssun]

Description

This PR fix building issue.

According to rust-lang/cargo#2904, I enabled cargo log with CARGO_LOG=cargo::core::compiler::fingerprint=trace and see this log:

[2021-12-14T02:19:39Z INFO  cargo::core::compiler::fingerprint]     err: RUSTFLAGS has changed: ["--cfg", "test_mode", "--cfg", "sgx_sim", "--cfg", "executor_builtin", "--cfg", "executor_mesapy", "--cfg", "executor_wamr", "--cfg", "test_mode"] != ["--cfg", "test_mode", "--cfg", "sgx_sim", "--cfg", "executor_builtin", "--cfg", "executor_mesapy", "--cfg", "executor_wamr"]

I realize that this additional test_mode flag affect the rebuild. However, when building with TEST_MODE=ON, the test_mode flag has been added to all services. Therefore, we can safely delete this.

Type of change (select or add applied and delete the others)

• Bug fix (non-breaking change which fixes an issue)

How has this been tested?

CI.

Checklist

• Fork the repo and create your branch from master.
• If you've added code that should be tested, add tests.
• If you've changed APIs, update the documentation.
• Ensure the tests pass (see CI results).
• Make sure your code lints/format.

[qinkunbao]

Thank you for this PR. When compiling in incremental mode, Teaclave compiled some unnecessary crates and libraries. This PR fixes the bug in the dependency and decreases the building time significantly.

[AI-Memory]

+1, thanks.