manage cookies for Transaction.readStatus()

[ehennum]

The Transaction.readStatus() method does not work with a load balancer because it doesn't call addTransactionScopedCookies() to manage the cookies used for host affinity.

Tracked as server bug 50603

[ehennum]

Should cause no regressions.

After ELB configuration to use hostId, GenericDocumentTest.testCommit() should run to completion successfully.

[ehennum]

With help from Matt and Hongyang, I confirmed that GenericDocumentTest.testCommit() now runs to completion successfully for an ELB configured for HostId.