- All accessors come up in exception state.
- Read-accessors increase counter in init phase

Assertion is gone, but tests still failing

This is not correlated to the new feature implemented in this branch. It
was needed to compile this version.

Test propagation of data validity and exception in the same cycle

Fix changes broken by renaming to ExceptionDummyBackend in DeviceAccess.

Changes should address timing related failures in the tests.

Fixture teardown functions now ensure the device dummybackends do no
throw on read or write.

activated tests for exception flag propagation with direct connection Device->ApplicationModule (part of #102)

- testInvalidTrigger
- testDeviceReadFailure
- testreadDeviceWithTrigger
- testConsumingFanout
- testDataFlowOnDeviceException

- device1 -> device1DummyBackend.
- device2 -> device2DummyBackend.

Test application structure:

CS +---> threaded fanout +------------------+
             +                              v
             +--------+                   +Device1+
                      |                   |       |
                      v                +--+       |
  CS   <---------+ Module1 <-------+   v          |
              |       ^            +Consuming     |
              |       +---------+    fanout       |
              +----+            +      +          |
                   v         Device2   |          |
  CS   <---------+ Module2             |          |
                                       |          |
  CS   <-------------------------------+          |
                                                  |
                                                  |
  CS   <---------+ Trigger <----------------------+
                      ^
                      |
                      +
                      CS

 - Add missing required dependencies for boost
 - Remove deprecated header. Also not needed on xenial