[TASK] Removes eval() in scheduler unit tests

[TASK] Removes eval() in scheduler unit tests

Adds a new AccessibleProxy for NormalizeCommand and removes
the ugly usage of eval() from NormalizeCommandTest in unit tests.

Change-Id: I2465be5918167582fae5e3e612c89a69b6b22657
Resolves: #67485
Related: #67468
Releases: master
Reviewed-on: http://review.typo3.org/40278
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>