Add connector cross channel config properties

[hutchig]

Signed-off-by: Gordon Hutchison Gordon.Hutchison@gmail.com

As discussed in today's hangout.

[cescoffier]

I've made a few comments. Before merging, I need to try implementing it, and the TCK needs to be extended to check this behavior.

[hutchig]

HOLD label as don't merge until merging on top of #22 as that affect the property name provider|connector etc.

[cescoffier]

@hutchig I've made another PR on the TCK (not related to this change).

[hutchig]

I cannot yet write/test tck changes as I have not built our connector support!

[hutchig]

Fixes 28 - well at least the concern that is left about having repeated similar properties for every channel of a connector.

[cescoffier]

I will extend the TCK in another PR.
Wondering if we need to update the Factory classes with this content also (it mentions the configuration format). WDYT?

[cescoffier]

Merging, the rest of the work can be done in other PRs.

[hutchig]

Thanks for merging - feel free to do this (from my POV) for any of my PRs that I request a review for that I have not put a HOLD label on.

[hutchig]

I did the javadoc changes for the Factories under #42