payment: fix for PaymentModule on Windows

See https://github.com/killbill/killbill/issues/226.

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
util: fix tests failures on Windows

See details in https://github.com/killbill/killbill/issues/226.

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
Merge remote-tracking branch 'origin/fix-for-226'
payment: fix potential NPE in PaymentOperation

This should never happen unless the plugin returns an invalid response.

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
payment: update to killbill-api 0.10.3

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
payment: plug control APIs from JAX-RS

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
payment: trivial cleanups

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
payment: fix NPE in RetryOperationCallback

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>