Nevermore BeginReadTransaction method does not create a SQL transaction and therefore will not hold a transaction name

[akirayamamoto]

I was writing some tests and found out that BeginReadTransaction method does not create a transaction and therefore will not hold a transaction name.

I could only find references to BeginReadTransaction on Octofront so Octopus Server is not affected.

I see these options for us:

• Change the Nevermore behavior to actually open a transaction when calling such method. This could cause lock issues on Octofront.
• Change the method name to something like BeginConnection instead so we are not expecting a transaction.

Tests here: #162
See related PR: #106