[MNG-828] add regression test for listing plugin configuration values in debug

[slawekjaranowski]

No description provided.

[belingueres]

Date parsing section of the test fails with a ParseException on my machine since AM/PM texts are Locale-dependent. Replace:

-        Date date = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss.S a" ).parse( "2008-11-09 11:59:03.0 AM" );
+        Date date = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss.S a", Locale.US ).parse( "2008-11-09 11:59:03.0 AM" );

[slawekjaranowski]

@belingueres PR are welcome