MP Rest Client does not honor MP Config-specified providers

[andymc12]

The MP Rest Client spec says that I should be able to specify providers via MP Config using comma-separated provider class names with the config key of <clientInterfaceName>/mp-rest/providers. It also specifies that provider priorities can be set using MP Config with the config key of <clientInterfaceName>/mp-rest/providers/<providerClassName>/priority.

Neither of these properties have any effect in Liberty.

Note that the MP Rest Client spec mentions this requirement for implementors, but does not currently test it in the TCK - this is being addressed in MP Rest Client Issue 126.

This should be considered a release bug.