Description of problem:
As described in BZ1146855, the suffix attribute on size-rotating-file-handler has a little bit different functionality than on other handlers (seconds or milliseconds are allowed). However the validation error message is the same as on other handlers ("seconds or milliseconds are not allowed").

Version-Release number of selected component (if applicable):
EAP 6.4.0.DR2

How reproducible:
Always

Steps to Reproduce:
 1. Start standalone and connect to CLI
 2. Add size handler with seconds
./subsystem=logging/size-rotating-file-handler=SIZE:add(file={path=/tmp/log}, suffix=HH-SS)
 3. Trigger validation error on suffix attribute
./subsystem=logging/size-rotating-file-handler=SIZE:write-attribute(name=suffix, value=x)

Actual results:
 "outcome" => "failed",
 "failure-description" => "JBAS011554: The suffix (x) is invalid. A suffix must be a valid date format and not contain seconds or milliseconds.",

Expected results:
 Error message specific to Size handler