[bug] fix several things on tests

* redefine the BaseLeapTest class so it inherits from
  twisted.trial.unittest.TestCase.

* allow passing the source_replica_uid when creating the sync target. This
  is needed because the SoledadHTTPSyncTarget needs to be instantiated with
  the source_replica_uid passed as a parameter.

* close the sync target in tests that use it.

* raise and U1DBError instead of an Exception on failure_and_retry test,
  because otherwise the u1db http app server will re-raise the Exception and
  twisted's WSGI server will raise the exception

* set defer_decryption=False in some sync_exchange() calls so the call
  is consistent with soledad instantiation in tests and the new signature of
  that method.

* yield get_sync_info() in tests that use this method.

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