JerseyServices.postResource was not passing through transaction (txid)

[sammefford]

In testing GraphManager I noticed that I was getting a deadlock until transaction timeout attempting a write then a merge on the same graph. That translates to a REST PUT then POST on the same uri in MarkLogic. In troubleshooting I found that JerseyServices.postResource was simply not passing the txid on the REST request. This is a problem that would affect any post requests with a transaction to a REST extension. We need to back-port this to the b2_0 branch (I'll create another issue)

[sammefford]

Oops, when I said b2_0 branch, I meant 2.0-develop branch (and thus 2.0-master, etc). But it turns out we don't need to back-port it at all because transactions are new in 3.x for the *Resource methods.

[sammefford]

@kkanthet as part of testing this, can you make sure we have regression tests for post operations with transactions against resource extensions? It looks like I created this regression on Apr 22 as part of 2ca9fd9 and the fact that it went unnoticed tells me our regression tests need something added for this use case.