CUSTCOM-27: Fix that steady-pool-size can be 0

[sergitrujillo]

Description

This is a bug fix
#4197

Notes for Reviewers

It's my first pull request to payara. Sorry if if did some mistake in some convenion.

[jbee]

jenkins test please

[jbee]

@smillidge Do we need a CLA for this small of a change?

[smillidge]

No that's too small and obvious to be covered by copyright.

[jbee]

@rdebusscher you seemed to know the context of PAYARA-4205 - maybe you can have a look and see if the change is the solution you were looking for in your comments.

[dmatej]

It is rather PAYARA-4207, 4205 was about the error message. Both issues should join in correct solution = correct check allowing zero steady pool size and correct error message.
I will finish the test case for that tomorrow (if Rudy does not already have some)

[rdebusscher]

@jbee The PR is good for the fix of the steady pool size. The 'issue' that we perform 2 checks (maxPoolSizeValue should be larger then steadyPoolSizeValue and values larger then 0) and show only 1 error message still needs to be addressed.

[dmatej]

Tested both with asadmin and DAS UI.