Pylint: Enable eval-used

[avylove]

eval() allows arbitrary code execution and should be avoided. This adds a Pylint check and removed cases where is was used. Most of those were simple changes, but ScriptTransformer required restricting what user input can do. simpleeval was used as it's close to the implementation of a mini-language without effort of creating one.

[avylove]

@squirrelsc , @LiliDeng Any issues with this?

[avylove]

Runbook I used to for testing., just changed timeout_value and script to test different cases.
lisa -r test.yml --debug 2>&1 | grep lisa.transformer

name: local test
notifier:
  - type: html
environment:
  environments:
    - nodes:
        - type: local
platform:
  - type: ready

variable:
  - name: timeout_value
    value: 0

transformer:
  - type: script
    rename:
      script_should_run: should_run
    scripts:
      - name: should_run
        variables:
          - timeout_value
        script: int(timeout_value) <= 0

[squirrelsc]

It needs to be tested with 1) gen1/gen2, 2) hibernate or rdma. Please let Lili know, if you don't know which test is suitable for this testing.

[LiliDeng]

tested TVM (gen2), sriov and RDMA, works well.

[LiliDeng]

will double check once back from holiday, thanks!