Partially enable testSingleTransactionsWritesInQuickSuccession()
Split the asserts into two methods, asserting the two datastore
options. The ask-based path remains disabled because it currently
fails tests.
Also improve tell-based protocol assertions, which need to wait
for the purge process to settle.
Change-Id: I8b2f3d84b2c7cd01dec4f7994eda716d022a98aa
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit
9503012683559849cd2f01b882b57fdcbcca59f0)
(cherry picked from commit
4d487764ab5a6402b15e275db9a458ece8c6a296)