Enhance the NarayanaLRAClient to be easier to configure and use

The NarayanaLRAClient is hard to grasp, configure and use. There should be a straightforward way to define where the coordinator could be found.

This will be beneficial for usage in different places. In the most recent time this change is needed for being able to configure different app servers to be run for tests.

Beside smaller adjustment the main idea is to use one single property to define the location of the LRA coordinator (ie. lra.coordinator.url). Currently there are multiple ones - host, port but there is missing path to be defined, scheme and there could be other nuances in special case. Taking single url configuration property fixes all of that.