[Documentation]: Description of To check if the CNF have a reasonable startup time are not clear

[CsatariGergely]

Describe the bug
Test case description To check if the CNF have a reasonable startup time does not define what the reasonable time is and it does not define if it is valid for the whole CNF or for the specific Pod-s of the CNF.

Expected behavior
1 The test case description should define what a reasonable startup time is.
2 The test case description should define if this is valid for the whole CNF or for the specific services of the CNF.
3 The rationale should explain the real issues of long startup time (e.g.: reliability) instead of pointing to "monolithic application"
4 The rationale should not mix CNF and the services of a CNF.

[kosstennbl]

Agree, the whole "reasonable_startup_time" still remains a mystery to me, it lacks clear description and good reasoning.
Possibly - this test should be reviewed and redesigned or removed altogether.