Converted tests 558 & 559 to use the unit test framework as 1305

Test 558 was just a subset of 559 which is something that can be
easily added later.

tests/data/test558

@@ -1,44 +0,0 @@
-<testcase>
-#
-# Server-side
-<reply>
-</reply>
-
-# Client-side
-<client>
-<server>
-none
-</server>
-# tool is what to use instead of 'curl'
-<tool>
-lib558
-</tool>
-# precheck is a command line to run before the test,
-# to see if we can execute the test or not
-<precheck>
-./libtest/lib558 check
-</precheck>
-
-<name>
-internal hash create/destroy testing
-</name>
-<command>
-nothing
-</command>
-</client>
-
-#
-# Verify data after the test has been "shot"
-<verify>
-<stdout mode="text">
-easy handle init OK
-creating hash...
-hash creation OK
-destroying hash...
-hash destruction OK
-destroying easy handle...
-easy handle destruction OK
-</stdout>
-</verify>
-
-</testcase>